AP United States History Period 5: 1844–1877 — Worked Answer Explanations

Unit 5 · 12 questions explained

Below is a complete answer key for our AP United States History Period 5: 1844–1877 practice questions. For each question you'll find the correct choice, a full written explanation of how to get there, and — for every wrong answer — a short note on exactly why it's tempting and where it goes wrong. Reading these straight through is one of the fastest ways to find the gaps in a unit before exam day.

Prefer to test yourself first? Take the timed Period 5: 1844–1877 practice test and come back here to review, or head back to the Period 5: 1844–1877 unit overview.

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Question 1 · Easy
The concept of Manifest Destiny, widely used in the 1840s, primarily expressed the belief that:
- A
  The United States should concentrate on improving conditions for its existing citizens before seeking new territory
  Why not A: Manifest Destiny was expansionist, not inward-focused; it justified territorial expansion, not consolidation.
- B
  The United States was divinely ordained to expand across the North American continent to the Pacific OceanCorrect
- C
  American democracy should be spread to Europe by military force
  Why not C: Manifest Destiny focused on continental North American expansion, not European intervention.
- D
  The federal government should purchase all remaining Native American lands through fair market transactions
  Why not D: Manifest Destiny encompassed dispossession of both Native peoples and Mexican citizens, not just peaceful purchase.
Explanation
The phrase 'Manifest Destiny,' coined by journalist John O'Sullivan in 1845, expressed the widely held belief that American expansion across the North American continent was both inevitable and divinely sanctioned. It provided ideological cover for the Mexican-American War, the displacement of Native peoples, and the acquisition of Oregon, Texas, California, and the Southwest. The doctrine blended nationalism, Anglo-Saxon racial ideology, and Protestant Christianity to justify territorial conquest.

Key takeaway
Manifest Destiny held that American continental expansion to the Pacific was divinely ordained — justifying war with Mexico and displacement of Native peoples.
Question 2 · Easy
The Compromise of 1850 is best understood as an attempt to:
- A
  Permanently resolve the question of slavery in all current and future U.S. territories
  Why not A: The Compromise only temporarily resolved the question; it was undone by the Kansas-Nebraska Act four years later.
- B
  Preserve the Union by balancing slave and free state concerns following the Mexican-American War's territorial acquisitionsCorrect
- C
  Begin the gradual abolition of slavery in states where it already existed
  Why not C: The Compromise did not touch slavery in existing slave states; it addressed only the new Mexican Cession territories.
- D
  Strengthen Mexico's claim to California in exchange for financial compensation from the United States
  Why not D: The Compromise addressed U.S. domestic politics; Mexico's claim to California had already been settled by the Treaty of Guadalupe Hidalgo.
Explanation
The Mexican-American War (1846–48) gave the U.S. a vast southwestern territory that immediately reignited the slavery debate. The Compromise of 1850, brokered by Henry Clay and Stephen Douglas, attempted to balance conflicting interests: California entered as a free state; the rest of the Mexican Cession would decide by popular sovereignty; the slave trade (but not slavery) was abolished in Washington D.C.; and the Fugitive Slave Act gave slaveholders new powers to reclaim escaped enslaved people in the North. Each provision satisfied and outraged different groups.

Key takeaway
The Compromise of 1850 temporarily balanced sectional tensions from Mexican Cession territories but included a Fugitive Slave Act that angered Northern abolitionists.
Question 3 · Easy
Which of the following best explains why the Kansas-Nebraska Act of 1854 shattered the second party system and directly led to the Republican Party's formation?
- A
  The act created a new tariff that united Northern manufacturers and Western farmers against Southern planters
  Why not A: The Kansas-Nebraska Act was about slavery's expansion into territories, not tariff policy.
- B
  By repealing the Missouri Compromise line and allowing popular sovereignty in territory north of 36°30', it outraged Northern voters who felt slave power had broken a sacred compactCorrect
- C
  The act attempted to completely abolish slavery and was defeated by Southern Whigs who then formed the Democratic Party
  Why not C: The act opened territory to slavery's potential expansion, not abolition; this description is the reverse of what happened.
- D
  Stephen Douglas introduced the act to help California and Oregon apply for statehood
  Why not D: California had already been admitted; the act organized Kansas and Nebraska territories and was about their potential status as slave or free.
Explanation
The Kansas-Nebraska Act (1854) allowed white male settlers in the Kansas and Nebraska territories to decide slavery's status by popular sovereignty — effectively repealing the Missouri Compromise's 36°30' prohibition on slavery north of that line. Northern voters — Whigs, Free Soilers, and antislavery Democrats — viewed this as a capitulation to 'Slave Power.' The Whig Party collapsed. A new coalition formed as the Republican Party (1854), committed to stopping slavery's expansion. The Democratic Party split along sectional lines. These realignments led directly to Lincoln's 1860 election and Southern secession.

Key takeaway
The Kansas-Nebraska Act (1854) repealed the Missouri Compromise's slavery ban, outraged Northern voters, collapsed the Whig Party, and created the Republican Party.
Question 4 · Easy
Lincoln's Emancipation Proclamation (January 1, 1863) is best understood as:
- A
  A comprehensive abolition of slavery throughout the entire United States
  Why not A: The Proclamation freed enslaved people only in Confederate-controlled states; it did not apply to border states or Union-controlled areas of the South.
- B
  A war measure that freed enslaved people in Confederate states, transforming the war into a struggle for human freedomCorrect
- C
  A constitutional amendment that permanently abolished slavery and required congressional ratification
  Why not C: The Proclamation was an executive order, not a constitutional amendment; the 13th Amendment (1865) permanently abolished slavery.
- D
  A diplomatic document primarily designed to prevent European nations from trading with the Union
  Why not D: The Proclamation aimed to discourage European recognition of the Confederacy, not to restrict Union trade.
Explanation
Lincoln issued the Emancipation Proclamation as a war measure under his commander-in-chief authority, arguing that depriving the Confederacy of enslaved labor was a military necessity. It freed enslaved people only in rebel-controlled states — not in border states or Union-controlled areas — so it freed few people immediately. But it transformed the war's meaning: the Union was now fighting to end slavery, which made European intervention on the Confederacy's behalf politically impossible. It also invited Black men to enlist in the Union Army, and 180,000 would serve.

Key takeaway
The Emancipation Proclamation was a war measure freeing enslaved people in Confederate states — transforming the Union cause and preventing European recognition of the Confederacy.
Question 5 · Easy
Which of the following best describes the primary goals of Radical Reconstruction (1867–1877)?
- A
  To punish Confederate leaders by permanently disenfranchising all white Southerners
  Why not A: Radical Reconstruction did not disenfranchise all white Southerners; it focused on reorganizing Southern state governments to include Black citizens.
- B
  To reconstruct Southern state governments on a basis of Black male suffrage and legal equality, protected by federal powerCorrect
- C
  To redistribute all former plantation land to formerly enslaved people as forty-acre farms
  Why not C: This was proposed (Sherman's Special Field Order No. 15) but was reversed; land redistribution failed under Reconstruction.
- D
  To readmit Southern states quickly with minimal conditions to restore national unity
  Why not D: This describes Lincoln's and Johnson's more lenient approaches; Radical Republicans explicitly rejected quick readmission without conditions.
Explanation
Radical Republicans in Congress, led by Thaddeus Stevens and Charles Sumner, believed that genuine reconstruction required creating a new social order in the South — not merely restoring the old Confederate leadership under new oaths. The Reconstruction Acts (1867) divided the former Confederate states into military districts, required new state constitutions guaranteeing Black male suffrage, and mandated ratification of the 14th Amendment as a condition for readmission. Black citizens voted, held office, and exercised legal rights for the first time — achievements dismantled by Redeemer governments after 1877.

Key takeaway
Radical Reconstruction aimed to remake Southern society through Black male suffrage and federal enforcement of legal equality — achievements ended by the Compromise of 1877.
Question 6 · Medium
A Southern newspaper editorial from 1861 declared: 'We secede not from rebellion but in defense of the constitutional right of self-determination — the same right invoked by our fathers in 1776.' The most effective historical rebuttal to this argument is that:
- A
  The Constitution explicitly prohibited any state from leaving the Union under any circumstances
  Why not A: The Constitution was actually silent on the right of secession; Lincoln's argument was about the nature of the Union, not an explicit anti-secession clause.
- B
  The Confederate states' own declarations of secession cited the preservation of slavery as the central cause, undermining claims of abstract constitutional principleCorrect
- C
  Southern states had prospered economically under the Constitution, proving the Union had not oppressed them
  Why not C: Economic prosperity does not disprove a constitutional rights argument; this is a weak rebuttal.
- D
  Lincoln had promised in his inaugural address not to interfere with slavery in existing slave states, so there was no justification for secession
  Why not D: Lincoln did make this pledge, but Southern states seceded before his inauguration; this doesn't fully rebut the constitutional argument.
Explanation
Confederate states' own declarations of causes for secession — Mississippi, Georgia, Texas, and others — explicitly stated that the preservation of slavery was their primary reason for leaving the Union. Mississippi's declaration read: 'Our position is thoroughly identified with the institution of slavery — the greatest material interest of the world.' This documentary record undermines 'Lost Cause' claims that secession was about abstract constitutional rights or states' rights divorced from slavery.

Key takeaway
Confederate states' own secession declarations explicitly named slavery's preservation as the cause — historical documentation that rebuts 'states' rights' revisionism.
Question 7 · Medium
The Thirteenth, Fourteenth, and Fifteenth Amendments together represented which fundamental change to American constitutional law?
- A
  They transferred primary sovereignty from the federal government to the states for civil rights enforcement
  Why not A: The Reconstruction Amendments increased federal power to protect civil rights against state action — the opposite of transferring power to states.
- B
  They fundamentally nationalized citizenship and civil rights, making the federal government the guarantor of equality against state violationsCorrect
- C
  They created an entirely new judicial system to handle civil rights cases outside the existing federal courts
  Why not C: No new court system was created; the amendments gave Congress enforcement powers and allowed federal courts to protect rights.
- D
  They limited federal power by specifying that rights enforcement was exclusively a state responsibility
  Why not D: Each amendment includes an enforcement clause explicitly giving Congress the power to enforce it — expanding federal authority.
Explanation
The Reconstruction Amendments represented a constitutional revolution. The 13th Amendment (1865) abolished slavery. The 14th Amendment (1868) made all persons born or naturalized in the U.S. citizens, guaranteed due process and equal protection of the laws, and gave Congress power to enforce these rights — inverting the antebellum understanding that states were the primary protectors of rights. The 15th Amendment (1870) prohibited denying the vote based on race. Together they created a new constitutional order, though enforcement was undermined by the Supreme Court and abandoned by the federal government after 1877.

Key takeaway
The Reconstruction Amendments nationalized citizenship and civil rights, making the federal government responsible for protecting equality against state violations.
Question 8 · Medium
How did the Freedmen's Bureau reflect both the achievements and limitations of Reconstruction?
- A
  It successfully redistributed former plantation land to freedpeople, creating a class of independent Black farmers throughout the South
  Why not A: Land redistribution was reversed by President Johnson in 1865; the Bureau could not deliver on this critical promise.
- B
  It provided education, legal assistance, and some economic resources to freedpeople while being undermined by inadequate funding, white resistance, and President Johnson's obstructionCorrect
- C
  It primarily served to return freed people to their former plantations under renamed labor conditions essentially identical to slavery
  Why not C: While the Bureau sometimes enforced exploitative labor contracts, this overstatement ignores its genuine educational and legal achievements.
- D
  It was fully supported by President Johnson and effectively operated for thirty years after the Civil War
  Why not D: Johnson opposed and actively undermined the Bureau; it was defunded by 1872.
Explanation
The Freedmen's Bureau (1865–1872) was the first major federal social welfare agency. It established schools — including many historically Black colleges and universities — provided medical care, adjudicated labor disputes, and helped freedpeople negotiate contracts. But it was chronically underfunded, opposed by President Johnson who vetoed its expansion, and unable to provide the land redistribution that would have given freedpeople true economic independence. Without land, freedpeople were economically dependent on white landowners, making sharecropping's debt peonage the dominant post-slavery labor system.

Key takeaway
The Freedmen's Bureau achieved real gains in education and legal protection but failed to provide land — leaving freedpeople economically dependent under sharecropping.
Question 9 · Medium
A freedman in Mississippi in 1868 stated: 'I have voted for the first time in my life and my vote counted as much as any man's. But the night riders burned my neighbor's barn for registering to vote.' This account most directly illustrates which dynamic of Reconstruction?
- A
  That Reconstruction was entirely successful in protecting the rights of freedpeople from white violence
  Why not A: The violence in the account contradicts any claim of complete success in protecting Black rights.
- B
  The tension between Reconstruction's legal achievements and the organized white terrorist violence used to undermine themCorrect
- C
  That Black men chose not to exercise their voting rights out of indifference to political participation
  Why not C: Black men voted in large numbers and enthusiastically participated in Reconstruction politics.
- D
  That freedpeople had no interest in civil and political rights, preferring only economic advancement
  Why not D: Freedpeople enthusiastically pursued both political rights and economic advancement simultaneously.
Explanation
This account captures the central paradox of Reconstruction: legal rights were real and transformative, but organized terrorist violence — the KKK, White League, Red Shirts — systematically intimidated Black voters, officeholders, and their white Republican allies. The federal government passed the Ku Klux Klan Acts (1870–71) and temporarily suppressed the Klan, but could not maintain sustained military presence across the South indefinitely. When the North tired of Reconstruction and withdrew troops after the Compromise of 1877, terrorist violence effectively ended Black political participation for generations.

Key takeaway
Reconstruction's legal achievements were real but undermined by organized white terrorist violence that federal enforcement could not permanently suppress.
Question 10 · Hard
The Mexican-American War (1846–1848) is most accurately described as which of the following in terms of its causes?
- A
  A defensive war to protect Texas from Mexican military aggression following an unprovoked invasion of U.S. soil
  Why not A: The disputed territory between the Nueces and Rio Grande was claimed by both nations; critics like Ulysses Grant called it 'the most unjust war.'
- B
  A war of deliberate American provocation in disputed territory, driven by desire for Mexican land and territorial expansionCorrect
- C
  A war declared by Mexico against the U.S. to reclaim Texas after the 1845 annexation
  Why not C: Mexico did not declare war; Polk claimed provocation when American troops were attacked in disputed territory he had sent them into.
- D
  A war fought primarily to protect American commercial interests in California from British seizure
  Why not D: While California was a goal, British seizure was not the actual threat; the war was fought against Mexico.
Explanation
President Polk ordered General Taylor to advance American troops into territory between the Nueces River and Rio Grande — claimed by both the U.S. and Mexico. When Mexican forces attacked, Polk claimed American blood had been shed on American soil. Congressman Abraham Lincoln challenged this with his 'spot resolutions,' demanding Polk identify the exact 'spot' where American blood was shed. Henry David Thoreau went to jail rather than pay taxes for the war. Many saw the conflict as manufactured aggression to seize Mexican territory for potential slave expansion.

Key takeaway
The Mexican-American War was provoked by Polk in disputed territory — many contemporaries like Lincoln and Grant condemned it as unjust aggression for territorial conquest.
Question 11 · Hard
Why did the Compromise of 1877 effectively end Reconstruction?
- A
  The Supreme Court ruled in 1877 that the 14th Amendment did not apply to state actions restricting Black civil rights
  Why not A: The Civil Rights Cases decision was in 1883, not 1877; the Compromise of 1877 was a political deal, not a court ruling.
- B
  The disputed 1876 election was resolved by giving Hayes the presidency in exchange for withdrawing federal troops from the South, removing protection for Black citizensCorrect
- C
  Congress passed legislation specifically prohibiting federal enforcement of the 14th and 15th Amendments
  Why not C: No such legislation was passed; the federal retreat was political and practical, not an explicit statutory repeal.
- D
  The Freedmen's Bureau was expanded and took over all Reconstruction enforcement responsibilities from the military
  Why not D: The Bureau had already been defunded in 1872; the Compromise of 1877 withdrew military protection, not the Bureau.
Explanation
The disputed 1876 election between Hayes (Republican) and Tilden (Democrat) — with three Southern states' electoral votes contested — was resolved by a political bargain. Republicans got the presidency for Hayes; Democrats got the withdrawal of remaining federal troops from Louisiana and South Carolina. Without federal military protection, 'Redeemer' Democratic governments in the South swiftly reversed Reconstruction reforms, disfranchised Black voters through violence and legal manipulation, and established the Jim Crow system that would persist for nearly a century.

Key takeaway
The Compromise of 1877 traded the presidency to Republicans for withdrawing federal troops from the South, abandoning Black Southerners to Redeemer violence and Jim Crow.
Question 12 · Hard
Which of the following best explains the failure of land redistribution ('forty acres and a mule') during Reconstruction, and why this failure had lasting consequences?
- A
  Freedpeople rejected land grants because they preferred urban industrial wage labor to farming
  Why not A: Freedpeople strongly desired land as the basis for economic independence; the failure came from political resistance, not their preferences.
- B
  President Johnson reversed land redistribution orders and restored confiscated plantations to former Confederate owners, leaving freedpeople landless and economically dependentCorrect
- C
  The 14th Amendment prohibited property redistribution because it required compensation under due process protections for all property holders
  Why not C: While due process concerns were raised, the reversal came from Johnson's executive actions restoring land to pardoned Confederates, not constitutional prohibition.
- D
  Congress refused to pass any land redistribution legislation because Radical Republicans opposed it as too radical
  Why not D: Radical Republicans like Thaddeus Stevens supported land redistribution; it was Johnson and moderate Republicans who blocked it.
Explanation
Sherman's Special Field Order No. 15 (January 1865) redistributed roughly 400,000 acres of coastal South Carolina and Georgia land to freedpeople in 40-acre tracts. When Johnson became president after Lincoln's assassination, he reversed this order, pardoned former Confederate planters, and restored their land. Without economic independence through land ownership, freedpeople were compelled to enter sharecropping arrangements that kept them trapped in debt peonage — a system of economic coercion that replicated many aspects of slavery. This failure of land redistribution is foundational to understanding persistent racial economic inequality.

Key takeaway
Johnson's reversal of land redistribution left freedpeople economically dependent on former enslavers, establishing sharecropping's debt peonage as the foundation of post-slavery racial inequality.