The Socialist Party of America (SPA), active from 1901 to 1972, was a political organization created by uniting the Social Democratic Party with dissenting groups from the Socialist Labor Party. It attracted backing from workers, immigrants, and reformers, attaining electoral achievements such as Eugene V. Debs’s presidential campaigns and successes in local government. However, its stance against U.S. participation in World War I and internal disagreements regarding the Russian Revolution undermined its cohesion.
Writers such as Debs portrayed socialism as an ethical necessity in opposition to capitalism, while Mereto highlighted the party’s contribution to the liberation of labor. Although its influence has waned, the SPA’s impact remains evident in its role in shaping labor movements and the ideological divisions that led to the formation of later groups. Its development illustrates the conflicts between socialist principles and the practical demands of political life.