<Tr> <Td_colspan="2"> Puerto Rico, U.S. Embassy in Vienna, October 24, 2014 </Td> </Tr> <Tr> <Td_colspan="2"> View newsreel scenes in Spanish of the Puerto Rican Nationalist Party Revolts of the 1950s on YouTube </Td> </Tr> <P> On October 30, 1950, Pedro Albizu Campos and other nationalists led a three - day revolt against the United States in various cities and towns of Puerto Rico, in what is known as the Puerto Rican Nationalist Party Revolts of the 1950s . The most notable occurred in Jayuya and Utuado . In the Jayuya revolt, known as the Jayuya Uprising, the Puerto Rican governor declared martial law, and attacked the insurgents in Jayuya with infantry, artillery and bombers under control of the Puerto Rican commander . The Utuado uprising culminated in what is known as the Utuado massacre . </P> <P> On November 1, 1950, Puerto Rican nationalists from New York City, Griselio Torresola and Oscar Collazo, attempted to assassinate President Harry S. Truman at his temporary residence of Blair House . Torresola was killed during the attack, but Collazo was wounded and captured . He was convicted of murder and sentenced to death, but President Truman commuted his sentence to life . After Collazo served 29 years in a federal prison, President Jimmy Carter commuted his sentence to times served and he was released in 1979 . </P>

How long has puerto rico been a part of america