This document defines ideology as a system of ideas and ideals that forms the basis of economic or political theory and policy. It then lists and provides brief descriptions of some major 19th century ideologies that ended in "ism", including liberalism, conservatism, capitalism, socialism, communism, nationalism, imperialism, and fascism. It asks the reader to consider where they fit on the political spectrum and defines some related terms like orthodox, heterodox, neo, and proto.