Columbia subject headings:
Progressivism (United States politics)
United States--Economic conditions--1865-1918.
United States--History--1913-1921.
United States--Social conditions--1865-1918.
World War, 1914-1918--United States.
Harvard subject headings:
Progressivism (United States politics)
United States--Economic conditions--1865-1918.
United States--History--1913-1921.
United States--Social conditions--1865-1918.
World War, 1914-1918--United States
Princeton subject headings:
Progressivism (United States politics)
United States--Economic conditions--1865-1918.
United States--History--1913-1921.
United States--Social conditions--1865-1918.
World War, 1914-1918--United States.