Tigris-Euphrates and Nile River valleys,
Indus valley, and later in China's Huang River Valley
Answer:
C.
they inhabited the land before the settlers arrived. Explanation:The natives of the United States, also popularly known as Native American, are the Amerindian ethnic groups that live in the United States and speak Amerindian languages, characterized by their diversity, lifestyle and socioeconomic status. The culture of the different tribes of Indians residing in the territory of the United States is very varied. The natives were the inhabitants of the continent long before the arrival of Europeans and their traditions and ways of life have managed to maintain themselves over time. Cherokees, Sioux or Apaches are the best-known tribes, but there are dozens.
The correct answer would be: Cultural and environmental factors.
Hope I helped you out! c:
