University of Groningen
American History: Documents: Documents: Open Door Note
Read the note Secretary of State John Hay sent to Andrew White, ambassador to Germany, spelling out the United States' position on keeping trade with China open despite the claims of European countries to various ports in China.
University of Virginia
Miller Center at Uva: u.s. Presidents: William Mc Kinley: Foreign Affairs
A good description of the foreign policy of President Wiliam McKinley including infornation about the Spanish-American War, the Open Door policy, and the annexation of the Hawaiian Islands.