U.S. Citizenship Day, known as Día de la Ciudadanía Americana, is observed in Puerto Rico every March 2. This day commemorates the anniversary of the Jones-Shafroth Act, which granted U.S. citizenship to Puerto Ricans born on or after April 25, 1898, without rescinding their Puerto Rican citizenship. Although Puerto Rico is an unincorporated territory of the United States, Puerto Ricans are considered natural-born citizens, though they do not enjoy all constitutional rights due to the partial application of the U.S. Constitution in such territories. U.S. Citizenship Day is an official observance in Puerto Rico, marked by various events organized by the Government of Puerto Rico. While it is not a public holiday, government offices and banks are closed for the day. The observance reflects the island's historical transition from a Spanish colony to a U.S. territory following the Spanish-American War and the Treaty of Paris in 1899.