Important dates in U. S. history By Wasko_Schools17 Period: 1600 to 1763 Colonial Settlement Period: 1763 to 1783 The American Revolution Period: 1783 to 1815 The New Nation Period: 1815 to 1880 National Expansion and Reform Period: 1861 to 1877 Civil War and Reconstruction Period: 1876 to 1900 Rise of Industrial America Period: 1900 to 1929 Progressive Era to New Era Period: 1929 to 1945 Great Depression and World War II Period: 1945 to 1968 The Post War United States, 1945-1968