The chronology used in this curriculum is based on common periodizations of American history. We use them to emphasize the connections between New Hampshire and United States history.  The chronology easily applies to local, state, and national history, allowing a course of study to make connections between local, state, national, and world events.   Era Description Date Era 1 Different Worlds Meet Beginnings to 1623 Era 2 Colonization and Settlement 1623-1763 Era 3 Revolution and the New Nation 1754-1820s Era 4 Expansion and Reform 1801-1861 Era 5 Civil War and Reconstruction 1850-1877 Era 6 Development of the Industrial US 1870-1900 Era 7 The Emergence of Modern America 1890-1930 Era 8 Great Depression and World War II 1929-1945 Era 9 Postwar United States 1945-1970s Era 10 Contemporary United States 1968-present