Final answer:
The time period after humans came to the Americas is called the Paleo-Indian period. It lasted until about 8,000 BCE and was characterized by the spread of humans as nomadic hunter/gatherers and the development of native cultures. The agricultural revolution also took place during this period.
Step-by-step explanation:
The time period after humans came to the Americas is called the Paleo-Indian period. It lasted from the time humans entered the Americas until about 8,000 BCE. During this period, humans spread throughout the Western hemisphere as nomadic hunter/gatherers. Native cultures developed and diversified during the Archaic (8,000-1,000 BCE) and the Woodland periods (1,000 BCE -1,000 CE). The development of agriculture, known as the agricultural revolution, also took place during this era.