The flag of Puerto Rico was adopted on the same day Puerto Rico gained a limited degree of autonomy as a Commonwealth associated with the United States.  The Puerto Ricans are so proud of their flag that their constitution states that no change will occur in the design of the flag until at least one year after its adoption.   Ironically, the same flag design caused a riot twenty years before when it was flown by Puerto Rican nationalists protesting American rule.  The origins of the flag are unclear:  some claim that the flag was designed by Manuel Besosa and sewn by his daughter, Mima while others say the flag was created by Antonia Velez Alvarado and first made by Micaela Dalmau de Carreras.  Puerto Rico Flag Adopted:  1952