Final answer:
The first cultural period in a given region in which the first signs of domestication are present is known as the Paleo-Indian period in Native American history. During this time, humans were nomadic hunter/gatherers who eventually developed agriculture during the Archaic and Woodland periods, leading to the agricultural revolution.
Step-by-step explanation:
The first cultural period in a given region in which the first signs of domestication are present is known as the Paleo-Indian period, which is part of Native American history in the Americas. During this period, humans spread throughout the Western hemisphere as nomadic hunter/gatherers. The development of agriculture, known as the agricultural revolution, occurred during the Archaic and Woodland periods, approximately from 8,000 BCE to 1,000 CE. Native American cultures began to domesticate plants, such as corn, beans, and squash, during these periods as well. This marked a significant turning point in human history.