USA HISTORY

Detailed explanation-1: -The history of American Indians before European contact is broadly divided into three major periods: the Paleo-Indian period, the Archaic period (8000–1000 b.c.), and the Woodland period (1000 b.c.–1600 a.d.).

Detailed explanation-2: -The oldest known civilization of the Americas was established in the Norte Chico region of modern Peru. Complex society emerged in the group of coastal valleys, between 3000 and 1800 BCE. The Quipu, a distinctive recording device among Andean civilizations, apparently dates from the era of Norte Chico’s prominence.

Detailed explanation-3: -The indigenous people hadn’t always been there, nor had they originated there, as some of their traditions state, but they had occupied these American lands for at least 20, 000 years.

Detailed explanation-4: -Now our understanding of when people reached the Americas-and where they came from-is expanding dramatically. The emerging picture suggests that humans may have arrived in North America at least 20, 000 years ago-some 5, 000 years earlier than has been commonly believed.