US History: 1887-2008 By Kyle Pennington Period: 1776 to 1860 Early American History Period: 1860 to 1877 Civil war/ Reconstruction Period: 1877 to 1900 The Gilded Age Period: 1890 to 1920 The Progressive Era Period: 1898 to 1910 Imperialism Period: 1914 to 1918 WW1