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."
Gag Law (Puerto Rico)
In 1914, the entire Puerto Rican House of Delegates demanded independence from the U.S. Instead, the U.S. imposed the Jones Act of 1917, which mandated U.S. citizenship on the entire island. The passage of the Jones Act coincided with America's entry unto World War I, and it allowed the U.S. to conscript Puerto Ricans into the U.S. military. The Jones Act was passed over the unanimous objection of the entire Puerto Rican House of Delegates, which was the legislature of Puerto Rico at that time. 
In addition to subjecting Puerto Ricans to the military draft, and sending them into World War I, the Jones Act created a bicameral, popularly elected legislature in Puerto Rico (following ratification of the Seventeenth Amendment to the United States Constitution in 1913 providing for popular election of senators), a bill of rights, and executive functions similar to those in most states. Because Puerto Rico was not a state, it did not have electoral status for U.S. presidential elections. The Act authorized popular election of the Resident Commissioner, previously appointed by the President of the U.S.