United Socialist Democratic Party (Tarper)

United Socialist Democratic Party Parti Démocrate Socialiste Uni Zjednoczona Partia Socjalistyczno Demokratyczna Partito Democratico Socialista Unito Forenede Socialistiske Demokratiske Parti Verenigde Socialistische Democratische Partij Vereinigte Sozialistische Demokratische Partei
Abbreviation	USDP
Founder	Charles Mark
Founded	May 1, 1860 (1860-05-01)
Dissolved	March 21, 1890 (1890-03-21)
Preceded by	Far Left Group
Succeeded by	Communist Party of Tarper Several communist and socialist parties of former imperial states (All not legal successors)
Newspaper	The Socialist Worker
Trade union	Imperial Congress for Labour National Workers' Confederation
Ideology	Socialism Marxism Federalism
Political position	Left-wing
National affiliation	Federalist Union (1880-1890)
Colors	Red
Slogan	"For Socialism in Our Lifetime"
Anthem	The Internationale
Party flag

The United Socialist Democratic Party, abbreviated as USDP and commonly referred to as the Socialists or Social Democrats, was a socialist and Marxist party present in the politics and National Imperial Congress of the Platesan Empire after the 1848 Revolution. Though the party never held the office of Imperator, it did manage to garner a large presence in the Imperial Congress during its thirty year existence.

The party is known for having produced various distinguished socialist and communist leaders of the late 19th and early 20th century. Among these leaders are; Ernesto Rivero, of Tarper, Guillame Lafayette, of Plamyadia, Gerard Landman, of Apostoli, and William Herrera, of La Madrepatria.