Puerto Rican citizenship
A 1918 official report from the American colonial governor of Puerto Rico to the U.S. Secretary of War, this one after the Jones Act of 1917, had become law, states that the "passports...[are used to] prove a person's nationality," thus making clear that Puerto Rican citizenship and Puerto Rican nationality were one and the same. The United States government also recognizes this status in its own records. For example, the CIA World Fact Book, states that the nationality of Puerto Ricans is not "American" but, in fact, ""Puerto Rican"." The Spanish Government also recognizes Puerto Ricans as a people with Puerto Rican, "and not American," citizenship. It also provides Puerto Rican citizens privileges not provided to citizens of several other nations, such as Haití, Jamaica, Trinidad y Tobago y Guyana. Since 2007, the Government of Puerto Rico has been issuing "Certificates of Puerto Rican Citizenship" to anyone born in Puerto Rico or born outside of Puerto Rico with at least one parent who was born in 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.