AP United States History Period 1: 1491–1607 — Worked Answer Explanations

Unit 1 · 12 questions explained

Below is a complete answer key for our AP United States History Period 1: 1491–1607 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 1: 1491–1607 practice test and come back here to review, or head back to the Period 1: 1491–1607 unit overview.

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Question 1 · Easy
The Columbian Exchange most directly contributed to population decline among indigenous peoples of the Americas primarily because of:
- A
  Warfare alone, as European armies systematically exterminated native populations
  Why not A: While warfare was deadly, disease was the primary driver of the catastrophic population collapse.
- B
  The introduction of Old World diseases to which indigenous peoples had little immunityCorrect
- C
  Famine caused by European destruction of indigenous agricultural systems
  Why not C: Famine played some role but was secondary compared to epidemic disease in causing mass death.
- D
  Voluntary emigration of indigenous people to Europe
  Why not D: There was no significant voluntary emigration from the Americas to Europe in this period.
Explanation
Smallpox, measles, influenza, and other Eurasian diseases devastated indigenous populations that had no prior exposure or acquired immunity. Scholars estimate that the native population of the Americas fell by 50–90% over the century following contact. This demographic collapse had profound social, political, and economic consequences that shaped the entire colonial era.

Key takeaway
Old World diseases caused catastrophic indigenous population collapse — the primary mechanism of demographic disaster in the Columbian Exchange.
Question 2 · Easy
The Treaty of Tordesillas (1494) is best understood as an attempt by Spain and Portugal to:
- A
  Establish a joint military alliance against French and English colonial competition
  Why not A: The treaty was about dividing colonial claims, not forming a military alliance.
- B
  Divide the non-European world between their two empires along a papal meridian lineCorrect
- C
  Regulate the slave trade between Africa and the Americas
  Why not C: The slave trade was not the subject of the Treaty of Tordesillas; the treaty addressed territorial claims.
- D
  Guarantee the religious conversion of all indigenous peoples within ten years
  Why not D: The treaty focused on territorial spheres of influence, not a timeline for religious conversion.
Explanation
After Columbus's 1492 voyage, Spain and Portugal nearly went to war over colonial claims. Pope Alexander VI mediated, and the 1494 Treaty of Tordesillas drew a north-south line through the Atlantic: Spain would claim lands to the west, Portugal to the east. This gave Portugal rights to Brazil and Africa; Spain received the rest of the Americas. Other European powers rejected this papal division, setting the stage for later colonial rivalries.

Key takeaway
The Treaty of Tordesillas divided the non-European world between Spain and Portugal along a meridian line; other European powers ignored it.
Question 3 · Easy
Which of the following best describes the agricultural systems of Mississippian mound-builder societies before European contact?
- A
  Nomadic hunting and gathering with no permanent settlements
  Why not A: Mississippian peoples built permanent towns centered on large earthen mounds, not nomadic camps.
- B
  Intensive maize agriculture supporting large, hierarchical urban centersCorrect
- C
  Exclusively maritime economies based on fishing and trade
  Why not C: Coastal fishing was important elsewhere, but Mississippians were inland agriculturalists.
- D
  Pastoralism centered on domesticated cattle and sheep
  Why not D: Pre-contact North American societies did not raise Old World livestock such as cattle or sheep.
Explanation
Mississippian culture (800–1600 CE) was built on intensive maize cultivation that supported dense populations and stratified societies centered on large towns like Cahokia. These were sedentary, hierarchical polities—not nomadic—organized around ceremonial earthen mounds. Their complexity challenges older 'pristine wilderness' narratives about pre-contact North America.

Key takeaway
Pre-contact North America contained complex, agricultural, hierarchical societies, not just small nomadic bands.
Question 4 · Easy
A Spanish colonial administrator writing in the 1540s described the encomienda system as 'a grant of Indian labor owed to those who served the Crown.' Which criticism most directly challenged this system?
- A
  That it violated mercantilist trade policies restricting colonial exports
  Why not A: Mercantilism is about trade regulation, not the ethics of Indian labor grants.
- B
  That Spanish colonists were not generating sufficient revenue for the Crown
  Why not B: This economic critique misses the central humanitarian argument made by critics like Las Casas.
- C
  That it reduced indigenous people to a condition functionally equivalent to slavery, violating their rights as human beingsCorrect
- D
  That it undermined Spanish military power by distracting soldiers from conquest
  Why not D: Critics like Bartolomé de Las Casas focused on moral, not military, grounds.
Explanation
Bartolomé de Las Casas and other Spanish clergy argued that the encomienda system subjected indigenous peoples to brutal forced labor that violated their humanity and Christian obligations. Las Casas's 'A Short Account of the Destruction of the Indies' (1542) was the most famous such critique, leading to the New Laws of 1542, which attempted (though largely failed) to curtail the worst abuses.

Key takeaway
The encomienda system exploited indigenous labor; critics like Las Casas argued it amounted to enslavement and was morally indefensible.
Question 5 · Easy
Which factor most directly explains why the Spanish were able to conquer the Aztec Empire with a relatively small military force in 1519–1521?
- A
  Spanish firearms were so superior that indigenous warriors refused to resist
  Why not A: Indigenous warriors fought fiercely; firearms advantage was real but not sufficient alone to explain conquest.
- B
  Alliance with indigenous peoples who resented Aztec tribute demands, combined with epidemic diseaseCorrect
- C
  The Aztec emperor voluntarily surrendered to avoid bloodshed
  Why not C: Moctezuma's actions are debated, but the Aztecs mounted sustained military resistance.
- D
  The Spanish arrived during a period when the Aztec Empire had already collapsed due to internal civil war
  Why not D: The Aztec Empire was at its peak when Cortés arrived, though subject peoples were resentful.
Explanation
Hernán Cortés succeeded largely because he forged alliances with peoples like the Tlaxcalans who deeply resented Aztec tribute extraction. These indigenous allies provided the bulk of the fighting force. Epidemic disease—smallpox especially—ravaged Tenochtitlan during the siege of 1521. Spanish steel, horses, and tactics mattered, but alliance-building and disease were decisive factors in a conquest that fundamentally reshaped Mesoamerica.

Key takeaway
Spanish conquest succeeded through indigenous alliances and epidemic disease, not just military technology alone.
Question 6 · Easy
A traveler describing the Great Plains around 1500 would most likely observe which of the following?
- A
  Mounted warriors following vast bison herds across the prairie
  Why not A: Horses did not reach the Great Plains until Spanish colonization; pre-contact Plains peoples were pedestrian.
- B
  Semi-sedentary peoples like the Mandan farming and hunting bison on footCorrect
- C
  Dense urban settlements comparable in size to European capitals
  Why not C: Great Plains populations were not organized into large urban settlements; Cahokia to the east was different.
- D
  Extensive cattle ranching operations managed by indigenous peoples
  Why not D: Cattle are Old World animals that did not exist in the Americas before European contact.
Explanation
Before Spanish introduction of the horse in the seventeenth century, Great Plains peoples were primarily pedestrian semi-sedentary societies. Groups like the Mandan and Hidatsa lived in permanent earth-lodge villages along rivers, farmed corn and squash, and supplemented their diet by hunting bison on foot using communal drives. The iconic 'horse culture' of the Plains — with mounted nomadic warriors — was a post-contact development that transformed indigenous life after about 1700.

Key takeaway
Pre-contact Plains peoples were pedestrian semi-sedentary farmers; the mounted horse-culture was a post-contact transformation.
Question 7 · Medium
How did the economies of the Pacific Coast peoples of present-day California and the Pacific Northwest differ from those of Southwestern pueblo societies in the pre-contact era?
- A
  Pacific Coast peoples relied on intensive agriculture, while Southwestern peoples were primarily hunters
  Why not A: This reverses the actual pattern; Southwestern puebloans were notable agriculturalists.
- B
  Pacific Coast peoples used acorn processing and salmon fishing, while Southwestern peoples practiced irrigation-based farmingCorrect
- C
  Both regions relied exclusively on bison hunting as their primary food source
  Why not C: Bison hunting was central to Great Plains peoples, not Pacific Coast or Southwestern societies.
- D
  Both regions developed identical economies based on long-distance overland trade
  Why not D: These two regions had distinct economies shaped by their different environments.
Explanation
Pacific Coast peoples like the Chumash and Northwest Coast groups such as the Chinook relied on abundant salmon runs and acorn harvests—resources so plentiful they supported densely populated, socially stratified societies without farming. Southwestern peoples like the Ancestral Puebloans and their descendants developed sophisticated irrigation techniques to grow maize, beans, and squash in an arid environment. This contrast illustrates how environment shaped indigenous economic systems.

Key takeaway
Pre-contact indigenous economies were shaped by environment — Pacific Coast peoples fished and gathered; Southwestern peoples irrigated crops in arid land.
Question 8 · Medium
A pamphlet circulated in Spain around 1550 argued: 'The natives of the Indies are by nature suited to be servants, lacking in reason sufficient for self-governance.' This argument most directly served to justify:
- A
  The Spanish crown's mercantilist restrictions on colonial trade
  Why not A: Mercantilist policy is an economic issue unrelated to Aristotelian arguments about natural servitude.
- B
  The forced conversion of indigenous people to Protestant Christianity
  Why not B: Spain promoted Catholic conversion; Protestant Christianity is anachronistic in this context.
- C
  The Spanish use of indigenous forced labor under encomienda and later repartimiento systemsCorrect
- D
  The return of conquered territory to indigenous rulers
  Why not D: This argument was used to extend Spanish control, not to restore indigenous sovereignty.
Explanation
The 'natural servitude' argument, drawn from Aristotle and championed by Juan Ginés de Sepúlveda in the famous Valladolid debate (1550–51), held that indigenous peoples were inferior beings suited to serve Spaniards. This intellectual framework provided ideological justification for forced labor systems like the encomienda and repartimiento. Las Casas directly countered this at Valladolid by arguing for the full humanity and rational capacity of indigenous people.

Key takeaway
The 'natural servitude' ideology was used to justify Spanish forced labor systems; Las Casas challenged it in the 1550 Valladolid debate.
Question 9 · Medium
In what way did the development of the Atlantic slave trade in the sixteenth century reflect broader patterns of the Columbian Exchange?
- A
  It was an unintended consequence with no economic motivation for European powers
  Why not A: The slave trade was explicitly profit-driven from its earliest stages.
- B
  It arose partly to replace indigenous labor lost to epidemic disease, connecting African labor to American land and European capitalCorrect
- C
  It was identical in structure to pre-existing indigenous American slavery practices
  Why not C: While some indigenous societies practiced forms of bondage, the Atlantic slave trade was a distinct, racialized, transatlantic commercial system.
- D
  It was initially confined to the English colonies and only later spread to Spanish America
  Why not D: The Spanish and Portuguese were first to develop transatlantic slavery; English involvement came later.
Explanation
The catastrophic decline of indigenous populations from disease created a labor shortage on Spanish plantations and mines. Portuguese slave traders and Spanish colonists responded by importing enslaved Africans, who had some immunity to Old World diseases. This created the brutal triangular Atlantic trade system linking European capital, African bodies, and American land — a core feature of colonial economies from Brazil to the Caribbean and later mainland North America.

Key takeaway
Atlantic slavery expanded partly to fill the labor vacuum created by indigenous population collapse from epidemic disease.
Question 10 · Medium
Which of the following best explains why the Spanish crown imposed the New Laws of 1542 restricting the encomienda system?
- A
  The crown was responding purely to humanitarian arguments with no concern for its own political power
  Why not A: The crown also worried about powerful colonists becoming independent lords, threatening royal authority.
- B
  A combination of humanitarian pressure from clergy and crown concern that powerful encomenderos threatened royal authorityCorrect
- C
  The indigenous population had recovered from disease and no longer needed protection
  Why not C: Indigenous populations were still collapsing in the 1540s; demographic recovery came much later, if at all.
- D
  The New Laws were primarily designed to increase colonial revenues by replacing labor tribute with cash taxation
  Why not D: Revenue concerns existed but were secondary; the main drivers were humanitarian and political.
Explanation
The New Laws of 1542 resulted from two converging pressures. Clergy like Las Casas argued vigorously that encomienda was morally wrong. Simultaneously, the Spanish crown feared that wealthy encomenderos were becoming semi-feudal lords whose power rivaled royal authority — as happened in medieval Europe. The crown used humanitarian arguments partly as cover for reining in colonial elites. Colonists resisted fiercely, and the New Laws were never fully enforced.

Key takeaway
The New Laws of 1542 reflected both humanitarian pressure from clergy and the crown's political interest in curtailing powerful colonial encomenderos.
Question 11 · Hard
Which of the following most accurately describes the long-term demographic consequence of the Columbian Exchange for the Americas?
- A
  Indigenous populations declined initially but fully recovered within one century due to European medical assistance
  Why not A: Recovery was extremely slow and incomplete; many groups never recovered their pre-contact populations.
- B
  The Americas were largely depopulated by disease, enabling European colonization and creating demand for enslaved African laborCorrect
- C
  Only coastal indigenous groups declined; interior populations were unaffected because they had no contact with Europeans
  Why not C: Diseases traveled ahead of direct European contact through trade networks, devastating interior peoples before they even met Europeans.
- D
  Population decline was limited to Central Mexico and had little effect on North American indigenous peoples
  Why not D: Disease devastation affected all regions of the Americas, including North America, at varying times.
Explanation
The 50–90% population decline caused by epidemic disease fundamentally reshaped the Americas. Depopulation cleared land that European settlers then occupied, with English colonists often settling on former indigenous agricultural clearings. Labor shortages on Spanish and Portuguese plantations drove the expansion of the Atlantic slave trade. The demographic catastrophe thus set in motion the triangular Atlantic world of European colonists, enslaved Africans, and increasingly marginalized indigenous peoples.

Key takeaway
Massive indigenous depopulation from disease enabled European colonization and created the labor gap that drove Atlantic slavery's expansion.
Question 12 · Hard
A Spanish chronicler writing in the 1570s noted: 'When we arrived, whole towns stood empty, the people dead and the houses still holding their corn. We took the land and the grain without contest.' This account most directly illustrates which historical process?
- A
  The effectiveness of Spanish military campaigns against organized indigenous resistance
  Why not A: The account emphasizes finding empty towns, suggesting death from disease rather than military conquest.
- B
  The role of epidemic disease in creating conditions that facilitated European territorial expansionCorrect
- C
  The voluntary abandonment of towns by indigenous peoples to avoid Spanish taxation
  Why not C: Voluntary tax avoidance would not leave corn stores behind or result in mass death consistent with disease.
- D
  The success of Spanish missionary conversion campaigns in persuading indigenous peoples to relocate
  Why not D: Missionary relocation was a different process; this account clearly describes mass death and empty settlements.
Explanation
This account describes the phenomenon historians call 'virgin soil epidemics' — diseases moving ahead of direct European contact, killing massive numbers and leaving empty settlements. Europeans arriving at such sites often interpreted the emptiness as providential evidence that God intended them to occupy the land. This framing obscured the catastrophic human tragedy of disease and became an ideological justification for colonization throughout the Americas.

Key takeaway
Epidemic disease often arrived before direct European contact, emptying entire towns and creating conditions that facilitated European settlement.