Puerto Rican citizenship
In 1952, upon U.S. Congress approving the Constitution of the Commonwealth of Puerto Rico, also reaffirmed that Puerto Rican citizenship continued in full force. This was further reaffirmed in 2006 while the U.S. Senate probed into the President's Task Force on Puerto Rico's status. In 1953, U.S Ambassador Henry Cabot Lodge Jr., in a memorandum sent to the United Nations, recognized that "the people of Puerto Rico continue to be citizens of the United States as well as of Puerto Rico."
Military history of Puerto Rico
Upon the outbreak of World War I, the U.S. Congress approved the Jones–Shafroth Act, which extended United States citizenship (the Puerto Rican House of Delegates rejected US citizenship) with limitations upon Puerto Ricans and made them eligible for the military draft. As citizens of the United States, Puerto Ricans have participated in every major United States military engagement from World War I onward.