World Socialist Party of the United States was created in 1916.
Socialist Workers Party - United States - was created in 1938.
Socialist Equality Party - United States - was created in 1966.
United Socialist Workers' Party was created in 1993.
United Socialist Party of Russia was created in 2003.
United Socialist Party - UK - was created in 2004.
United Jewish Socialist Workers Party was created in 1917.
Scottish Socialist Party United Left was created in 2006.
International Workers Party was created in 1974.
Freedom Socialist Party was created in 1966.
Constitution Party - United States - was created in 1991.
Union Party - United States - was created in 1936.
Green Party of the United States was created in 1991.