John L. O’Sullivan was an influential journalist and supporter of the Democratic Party. In 1839, he laid out historical, moral, political, and economic reasons for westward expansion. In 1845, O’Sullivan rallied support for the annexation of the…

Mexican immigration to the United States increased dramatically during the decade of the Mexican Revolution (1910-20). Some in the U.S. welcomed the newcomers, while others worried about the effects they would have on American society. This 1912…

Edward Curtis was a professional photographer of the American West. In 1906, the wealthy banker and art collector J.P. Morgan hired Curtis to produce a multi-volume series on Native Americans that would include essays, sound recordings, and 1500…