Puerto Rican citizenship
Puerto Rican citizenship was first legislated by the United States Congress in Article 7 of the Foraker Act of 1900 and later recognized in the Constitution of Puerto Rico. Puerto Rican citizenship existed before the U.S. takeover of the islands of Puerto Rico and continued afterwards. Its affirmative standing was also recognized before and after the creation of the Commonwealth of Puerto Rico in 1952. Puerto Rican citizenship was recognized by the United States Congress in the early twentieth century and continues unchanged after the creation of the Commonwealth of Puerto Rico. The United States government also continues to recognize a Puerto Rican nationality. Puerto Rican citizenship was once also recognized by the Spanish Government, which recognized Puerto Ricans as a people with Puerto Rican, and not American citizenship. It also at one time granted Spanish citizenship to Puerto Ricans on the basis of their Puerto Rican (and not American) citizenship.
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.