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c. 9500 BC – Cordilleran and Laurentide Ice Sheets retreat enough to open a habitable ice-free corridor through the northern half of the continent (North America) along the eastern flank of the Rocky Mountains. c. 1000 BCE-1000 CE – Woodland Period of Pre-Columbian Native Americans in Eastern America.
The 14th century in America probably also brought decline of the Mississippian culture, especially in the northern states. Dendroclimatology suggests that severe droughts ravaged the American Southwest and especially the Southern Plains early in the period, leading to a rapid cultural decline.
The following table is a list of all 50 states and their respective dates of statehood. The first 13 became states in July 1776 upon agreeing to the United States Declaration of Independence, and each joined the first Union of states between 1777 and 1781, upon ratifying the Articles of Confederation, its first constitution. [6]
Timelines of United States history by period (time span) — of pre−nationhood and national U.S. history. Pages in category "Timelines of United States history by period" The following 12 pages are in this category, out of 12 total.
United States in World War I (1917–1918) Roaring Twenties (1920–1929) Fifth Party System (1932–1980) Great Depression (1929–1939) United States home front during World War II (1942–1945) Post-World War II (1945–1964) Civil Rights Movement (1954–1968) United States in the Vietnam War (1955–1973) Sixth Party System (1980–present)
Timeline of pre–United States history; Timeline of the history of the United States (1760–1789) Timeline of the history of the United States (1790–1819) Timeline of the history of the United States (1820–1859) Timeline of the history of the United States (1860–1899) Timeline of the history of the United States (1900–1929)
North American archaeological periods divides the history of pre-Columbian North America into a number of named successive eras or periods, from the earliest-known human habitation through to the early Colonial period which followed the European colonization of the Americas.
South America: Chile: 18.5-14.5: Monte Verde: Carbon dating of remains from this site represent the oldest known settlement in South America. [65] [66] South America: Peru: 14: Pikimachay: Stone and bone artifacts found in a cave of the Ayacucho complex [67] North America: Santa Rosa Island: 13: Arlington Springs site: Arlington Springs Man ...