Lesson 1: The First Americans

Key Idea

Scientists believe the first people came to the Americas from Asia thousands of years ago. One major theory suggests they walked across a landmass called the Bering Land Bridge, which connected Asia and North America. These early people were likely following herds of large animals.

Another theory proposes that some people traveled by boat. This coastal migration theory suggests they moved down the Pacific coast, fishing and hunting along the way. These different migration routes help explain how people spread throughout the vast continents of North and South America.

Key Idea

Ancient peoples looked for specific natural features when choosing a place to settle. These environmental factors included a reliable source of fresh water, the shape of the land, and the types of plants that grew nearby.

The shape of the land, or topography, was important. Flat plains near rivers were ideal for farming. The local vegetation, or plant life, provided food and materials for making tools and shelter.

Key Idea

For thousands of years, the first peoples in the Americas survived by hunting animals and gathering wild plants. Around 7,000 BCE, a major change began in Mesoamerica as people started to plant and cultivate crops. This slow but transformative shift from a nomadic lifestyle to farming is known as the Agricultural Revolution.

Over time, early Americans learned to domesticate plants, creating a more reliable food supply. The most important of these crops was maize (corn), along with beans and squash. Access to a consistent source of food meant that groups no longer needed to constantly wander in search of their next meal.

Key Idea

With stable food from farming, the first complex societies appeared in Mesoamerica and South America. The Olmec developed a large trading network and built major religious centers. In South America, early cultures like the Chavín also created influential societies with distinct art and temples.

Later civilizations, like the Zapotec, built on these foundations. Some created the first planned cities in the Americas, such as Teotihuacán. This massive city featured a grid layout, huge pyramids, and a large population, showing a high level of organization.