History of the United States (1789–1849) History of the United States (1849–1865) Timeline of the American Old West; Further reading 1820s. John S. Galbraith. "British-American Competition in the Border Fur Trade of the 1820s". Minnesota History, Vol. 36, No. 7 (Sep., 1959), pp. 241–249.
Kutler, Stanley L., ed. Encyclopedia of the United States in the Twentieth Century (4 vol, 1996) Morris, Richard, ed. Encyclopedia of American History (7th ed. 1996) Schlesinger, Jr., Arther M. The Almanac of American History (1983) See also. Causes of the Great Depression; Great Contraction; Timeline of modern American conservatism