Why was 1917 an important year for Puerto Rico?

In 1917, the United States Congress passed the Jones-Shafroth Act, also known as the Jones Act, granting Puerto Ricans U.S. citizenship. The law was signed by President Woodrow Wilson on March 2, 1917. The Jones Act also established a locally elected Senate and House of Representatives, although the U.S.-appointed governor retained veto power over legislation. The act was a significant step towards Puerto Rico's eventual commonwealth status in 1952.