Socialist Party of America

The Socialist Party of America (SPA) was a socialist political party in the United States formed in 1901 by a merger between the three-year-old Social Democratic Party of America and disaffected elements of the Socialist Labor Party of America who had split from the main organization in 1899. In the first decades of the 20th century, the SPA drew significant support from many different groups, including trade unionists, progressive social reformers, populist farmers and immigrants.

Source: Wikipedia — Socialist Party of America (CC BY-SA 4.0)