The United States History By LauGraceEducator 1492 Columbus Discovered the "New World" He landed in the Bahamas Sep 6, 1620 The Mayflower The Pilgrims land at Plymouth Rock Period: 1775 to 1783 The American Revolution Jul 4, 1776 The Declaration of Independence was Signed Period: Apr 12, 1861 to Apr 9, 1865 The American Civil War Apr 13, 1861 Battle of Fort Sumter Sep 11, 2001 Terrorists Attack the World Trade Center in NYC