<P> Spanish--American War flag: flag of the Batallón Provisional No. 3 de Puerto Rico (3rd Provisional Battalion of Puerto Rico). </P> <Li> <P> Flag of Spain (1873--1874) First Spanish Republic . </P> </Li> <P> Flag of Spain (1873--1874) First Spanish Republic . </P> <Li> <P> Original Puerto Rican flag design of 1895 </P> </Li>

What does the puerto rico flag stand for