This unit covers the Americas before 1492, the European voyages that reached them, and the exchange of crops, animals, and diseases that followed. By the end, you should be able to explain how diverse Native societies were, why Europeans sailed west, and how contact changed life on both sides of the Atlantic.
Read the big ideas first, then work through each topic note and answer its checkpoint question before moving on.
Unit 1 sets up the rest of the course by showing who lived in the Americas, who arrived, and what happened when they met. Almost every later topic, from colonial labor systems to westward expansion, traces back to the patterns that start here.
Honors US History Unit 1 covers three topics. First come Native American civilizations before European contact, including the Maya, Aztec, Inca, Mississippian, Ancestral Puebloan, and Haudenosaunee (Iroquois) peoples. Next come European exploration and early settlements, especially the Portuguese and Spanish voyages of the 1400s and 1500s and the first English, French, and Dutch claims. Last is the Columbian Exchange, the two-way transfer of plants, animals, diseases, and people between the hemispheres after 1492. Expect to read primary sources like explorer accounts and to write arguments about causes and effects of contact.
Some groups built large cities, like the Aztec capital Tenochtitlan, which may have had 200,000 people. Others lived in small mobile bands. Farming societies grew maize, beans, and squash, and coastal or Arctic peoples relied on fish and marine mammals. Geography shaped food, housing, and political organization.
Kingdoms wanted direct access to Asian spices and silk, plus gold and silver once they found it in the Americas. Spreading Catholic Christianity gave voyages religious justification. Caravels, the magnetic compass, and the astrolabe let sailors travel farther from shore and return home.
New World crops like potatoes and maize boosted food supplies across Afro-Eurasia. Old World diseases like smallpox killed a huge share of Native people, often before they ever met a European. Demand for labor in the Americas, along with the decline of Native populations, helped expand the existing transatlantic slave trade.
For thousands of years, the Americas and Afro-Eurasia developed many different crops, domesticated animals, and diseases, with limited contact between them. After Columbus crossed the Atlantic in 1492, exchanges between the regions expanded over time. Disease, alliances, and access to resources shaped the outcomes.
Before 1492, somewhere between 40 and 100 million people lived in the Americas (historians still debate the number).
European kingdoms sponsored overseas voyages to seek wealth, spread Christianity, and gain an edge on rivals.
The Columbian Exchange is the transfer of plants, animals, diseases, and people between the Americas and Afro-Eurasia that began after 1492.
Before 1492, somewhere between 40 and 100 million people lived in the Americas (historians still debate the number). They spoke hundreds of languages and organized themselves in very different ways.
In Mesoamerica, the Olmec (c. 1200-400 BCE) built early ceremonial centers and giant stone heads. The Maya peaked in the Classic period (c. 250-900 CE), with city-states like Tikal, a written script, and an accurate calendar. The Aztecs (Mexica) founded Tenochtitlan around 1325 and ruled an empire held together by tribute from conquered peoples. They farmed on chinampas, artificial islands in Lake Texcoco.
In the Andes, the Inca built an empire stretching about 2,500 miles, linked by roads. Under the mit'a system, communities provided required labor for the state. The Inca kept records with knotted strings called quipu.
In what is now the United States, the Mississippian city of Cahokia (near modern St. Louis) had perhaps 10,000 to 20,000 people around 1100 CE. Ancestral Puebloans built multistory dwellings at Chaco Canyon and Mesa Verde. In the Northeast, five nations formed the Haudenosaunee (Iroquois) Confederacy, where clan mothers chose and could remove chiefs. Some Plains peoples farmed as well as hunted, while Arctic communities combined hunting and fishing with different patterns of seasonal movement and settlement.
Why did Pueblo peoples and Northwest Coast peoples develop different ways of life? (Answer: Their environments differed. Pueblo peoples farmed in the dry Southwest, using methods such as irrigation and rainfall farming. Many Northwest Coast peoples relied on salmon, other marine foods, and forest resources rather than farming.)
| Society | Region | Known for |
|---|---|---|
| Maya | Yucatan and Central America | City-states, writing, calendar, astronomy |
| Aztec (Mexica) | Central Mexico | Tenochtitlan, tribute empire, chinampas |
| Inca | Andes Mountains | Road network, mit'a labor, quipu records |
| Mississippian | Mississippi River valley | Earthen mounds at Cahokia, trade networks |
| Ancestral Puebloan | Southwest US | Cliff and multistory dwellings, irrigation |
| Haudenosaunee | Northeast woodlands | Confederacy, Great Law of Peace, clan mothers |
European kingdoms sponsored overseas voyages to seek wealth, spread Christianity, and gain an edge on rivals. Italian and Ottoman middlemen controlled the trade in Asian spices and silk, so Atlantic kingdoms wanted their own sea route. The Ottoman capture of Constantinople in 1453 is often cited, but Portugal was already exploring Africa's coast decades earlier under Prince Henry the Navigator.
Portugal led first. Bartolomeu Dias rounded Africa's southern tip in 1488, and Vasco da Gama reached India in 1498. Spain backed Christopher Columbus, who landed in the Bahamas in October 1492 believing he had reached Asia. The Treaty of Tordesillas (1494) divided lands claimed by Spain and Portugal along an Atlantic line without consulting the people who lived there. Portugal later colonized Brazil, where Portuguese became the main language.
Spain then conquered the two largest empires. Hernan Cortes took Tenochtitlan in 1521 with help from tens of thousands of Native allies like the Tlaxcalans, and smallpox weakened the city. Francisco Pizarro captured the Inca ruler Atahualpa in 1532. Spanish colonists used the encomienda system to force Native people into labor, which the priest Bartolome de las Casas condemned.
Other powers came later. John Cabot sailed for England in 1497, Jacques Cartier for France in 1534, and Henry Hudson for the Dutch in 1609. Spain founded St. Augustine in 1565, England founded Jamestown in 1607, and France founded Quebec in 1608.
Name two reasons a few hundred Spanish soldiers could defeat the Aztec Empire. (Answer: Smallpox killed many people in Tenochtitlan, and thousands of Native allies such as the Tlaxcalans fought alongside the Spanish against the Aztecs. Steel weapons and horses also helped.)
The Columbian Exchange is the transfer of plants, animals, diseases, and people between the Americas and Afro-Eurasia that began after 1492. It flowed in both directions, and its effects reached China and Africa as well as Europe.
American crops changed diets worldwide. Potatoes produced more calories per acre than wheat and became a staple in Ireland and northern Europe. Maize spread to Africa and China, and manioc (cassava) grew well in poor tropical soils in Africa. These crops helped populations grow over the next few centuries.
Old World livestock remade the Americas. Cattle, pigs, and sheep spread fast and trampled Native fields. Horses spread among some Plains peoples before the 1680 Pueblo Revolt, and the revolt put more horses in Native hands. Peoples such as the Comanche and Lakota later hunted bison on horseback. Sugarcane brought to the Caribbean and Brazil became the basis of brutal plantation economies.
Disease was the deadliest part. Native communities generally had no prior exposure to diseases such as smallpox and measles, and epidemics caused enormous population losses. The timing and scale of those losses varied, and some epidemics traveled along trade routes ahead of Europeans. European demand for labor in the Americas helped expand the existing transatlantic slave trade. About 12.5 million Africans were forced onto slave ships, and about 10.7 million survived the Atlantic crossing. Silver from mines like Potosi, found in 1545, entered global trade.
How did epidemics in the Americas help expand the transatlantic slave trade? (Answer: Epidemics reduced Native populations that colonists had forced to work. Demand for labor, especially on plantations, helped expand an Atlantic slave trade that already existed.)
| Direction | Plants | Animals | Diseases |
|---|---|---|---|
| Americas to Afro-Eurasia | Maize, potatoes, tomatoes, cacao, tobacco, manioc | Turkeys | Possibly syphilis (debated) |
| Afro-Eurasia to Americas | Wheat, rice, sugarcane, coffee, bananas | Horses, cattle, pigs, sheep, chickens | Smallpox, measles, influenza, malaria |
| Term | Definition |
|---|---|
| Columbian Exchange | The two-way transfer of plants, animals, diseases, and people between the Americas and Afro-Eurasia that began after 1492. |
| Tenochtitlan | The Aztec capital built on an island in Lake Texcoco, the site of present-day Mexico City. |
| Cahokia | The largest Mississippian city, near present-day St. Louis, known for huge earthen mounds like Monks Mound. |
| Haudenosaunee (Iroquois) Confederacy | An alliance of five Northeastern nations, later six, governed by the Great Law of Peace. |
| Mit'a | The Inca system of required labor for the state, later adapted by the Spanish to force Native people into silver mines. |
| Treaty of Tordesillas | A 1494 agreement that divided newly claimed lands outside Europe between Spain and Portugal along a line in the Atlantic. |
| Encomienda | A Spanish colonial grant giving a settler a claim to tribute from Native communities. Tribute could include goods or labor, and the system often led to forced labor. |
| Mercantilism | An economic theory that a nation grows powerful by piling up gold and silver and exporting more than it imports, often using colonies to do it. |
| Conquistador | A Spanish soldier-explorer who conquered territory in the Americas, such as Hernan Cortes or Francisco Pizarro. |
Textbooks often group everyone before 1492 under one label. An Aztec noble in Tenochtitlan, a city that may have had 200,000 people, and an Inuit seal hunter lived in very different societies. When you write about Native peoples, name the specific group and region.
Millions of people already lived there, and Norse sailors reached Newfoundland around 1000 CE. What made 1492 different is that it started lasting contact between the hemispheres. Say Columbus began sustained European contact instead.
Guns and steel mattered, but disease and Native allies mattered more in cases like the fall of Tenochtitlan. Cortes had a few hundred Spaniards and tens of thousands of Tlaxcalan and other Native soldiers. A strong answer names disease, alliances, and existing political divisions.
It's easy to focus on smallpox and forget that American crops fed much of the world. The exchange moved in both directions and included plants, animals, people, and ideas. Give at least one example going each way when you explain it.