Columbia subject headings:
Political parties--Puerto Rico--History.
Puerto Rico--Politics and government--1898-1952.
Puerto Rico--Relations--United States.
United States--Relations--Puerto Rico.
Violence--Puerto Rico.
Harvard subject headings:
Political parties--Puerto Rico--History.
Puerto Rico--Politics and government--1898-1952.
Puerto Rico--Relations--United States.
United States--Relations--Puerto Rico.
Violence--Puerto Rico.
Princeton subject headings:
Government, Resistance to--Puerto Rico--History--20th century.
Puerto Rico--History--1898-1952.
Puerto Rico--Politics and government--1898-1952.
Violence--Puerto Rico--History--19th century.