History of U.S. Interventions in Latin America a listing of the key interventions. Kept up to date
U.S. Intervention in Latin America Another listing, not so comprehensive, but more subjective, from the Latin America Solidarity Homepage, this is a (not impartial) timeline of U.S. imperialism towards Latin American countries from the Monroe Doctrine (1823) §
US-Latin American Relations This is a very comprehensive site created and maintained by Richard W. Slatta Professor of History, NY State.
The Second Century: U.S.-Latin American Relations Since 1889 By Mark T. Gilderhus. A Google Book extract. Focuses on U.S. relations with Latin America during the second century, a period bounded by the advent of the New Diplomacy late in the nineteenth century and the end of the Cold War.