The history of the United States was preceded by the arrival of Native Americans in North America around 15,000 BC. Numerous indigenous cultures formed, and many disappeared in the 16th century.

More detail go to online from Wikipedia.

Feature:
1 Prehistory
2 European colonization
3 Road to independence
4 Revolution and independence
5 Early years of the republic
6 Westward expansion
7 Sectional conflict and Civil War
8 Growth and industrialization
9 Discontent and reform
10 War, prosperity, and depression
11 Cold War, counterculture, and civil rights
12 21st century