Columbia subject headings:
Progressivism (United States politics)
United States--Politics and government--1865-1900.
United States--Politics and government--20th century.
Harvard subject headings:
Progressivism (United States politics)
United States--Politics and government--1865-1900.
United States--Politics and government--20th century.
Princeton subject headings:
Progressivism (United States politics)
United States--Politics and government--1865-1933.
United States--Social conditions--1865-1918.