1898-First U.S. troops land and occupy Puerto Rice, at Guanica Bay
1947-U.S. Deptartment of the Army created
1952-Commonwealth of Puerto Rico created (Constitution Day)
1956-Italian liner Andrea Doria sank after colliding with the Stockholm
1956-Jordanians attack UN Palestine truce
1957-Monarchy in Tunisa abolished in favor of a republic
1964-Race riot in Rochester, N.Y.
1972-U.S. health officials concede blacks were used as guinea pigs in
40 year syphillis experiment
1983-First nonhuman primate (baboon) conceived in a lab dish, San Antonio
1987-USSR launches Kosmos 1870, 15-ton Earth-study satellite
1990-US Ambassador tells Iraq, US won't take sides in Iraq-Kuwait dispute
1992-25th Olympic Summer games opens in Barcelona, Spain