U.S. History 1887-2008 By najadkins Period: 1776 to 1860 Early American History Jul 4, 1776 Declaration Of Independence (signed) Sep 17, 1787 Constitution (written) Dec 15, 1791 Bill of Rights (ratified) Period: 1860 to 1877 Civil War/Reconstruction 1869 Transcontinental Railroad (completed) 1876 Telephone invented by Alexander Graham Bell Period: 1877 to 1900 The Glided Age Period: 1890 to 1920 The Progressive Era Period: 1898 to 1910 Imperialism Period: 1914 to 1918 World War I Period: 1920 to 1929 Roaring Twenties Period: 1929 to 1939 Great Depression Period: 1939 to 1949 World War II Period: 1945 to 1960 Early Cold War Period: 1950 to 1970 Civil Rights Era Period: 1954 to 1976 Vietnam War Period: 1970 to 1991 End of the Cold War Period: 1990 to 2008 1990s-21st Century