The was a political party in France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

 founded in 1935 during the late Third Republic

French Third Republic

The French Third Republic was the republican government of France from 1870, when the Second French Empire collapsed due to the French defeat in the Franco-Prussian War, to 1940, when France was overrun by Nazi Germany during World War II, resulting in the German and Italian occupations of France...

 which united the right-wing of the French Section of the Workers' International.

The USR was founded by the following parties:

• Socialist Party of France-Jean Jaurès Union
  Socialist Party of France-Jean Jaurès Union
  The ' was a political party in France founded in 1933 during the late Third Republic which united the right-wing of the French Section of the Workers' International ....
  
  
• French Socialist Party (1919)
  French Socialist Party (1919)
  The French Socialist Party , the second political party to exist under this name, was a political party in France founded in 1919 during the Third Republic which emerged from the right-wing of the French Section of the Workers' International...
  
  
• Republican-Socialist Party
  Republican-Socialist Party
  The Republican-Socialist Party was a French socialist political party during the French Third Republic, founded in 1911 and dissolved in 1934. It was founded by socialists who refused to join the SFIO founded in 1905. The PRS was a non-Marxist "reformist socialist" party located between the SFIO...
  
  

The USR participated in the Popular Front

Popular Front (France)

The Popular Front was an alliance of left-wing movements, including the French Communist Party , the French Section of the Workers' International and the Radical and Socialist Party, during the interwar period...

 but was effectively killed by World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

. Most of its members returned to the French Section of the Workers' International or participated in the Rally of Republican Lefts

Rally of Republican Lefts

The Rally of Republican Lefts was an electoral alliance during the French Fourth Republic composed of the Radical Party, the Independent Radicals, the Democratic and Socialist Union of the Resistance and several conservative groups...

.