The Popular Republican Union was a Christian democratic party in Alsace

Alsace

Alsace is the fifth-smallest of the 27 regions of France in land area , and the smallest in metropolitan France. It is also the seventh-most densely populated region in France and third most densely populated region in metropolitan France, with ca. 220 inhabitants per km²...

, 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...

 during the 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...

. Founded in 1919, the UPR became the dominant party in Alsace

Alsace

Alsace is the fifth-smallest of the 27 regions of France in land area , and the smallest in metropolitan France. It is also the seventh-most densely populated region in France and third most densely populated region in metropolitan France, with ca. 220 inhabitants per km²...

 during the Interwar era. In Lorraine

Lorraine (région)

Lorraine is one of the 27 régions of France. The administrative region has two cities of equal importance, Metz and Nancy. Metz is considered to be the official capital since that is where the regional parliament is situated...

, the Lorrain Republican Union

Lorrain Republican Union

The Lorrain Republican Union was a Christian democratic party in Moselle, France during the Third Republic. Founded in 1919, the URL became the dominant party in Moselle during the Interwar era. In Alsace, the Popular Republican Union was considered the UPR's sister party...

 (URL) was considered the UPR's sister party. The UPR was much more conservative than the Popular Democratic Party

Popular Democratic Party (France)

The Popular Democratic Party was a non-confessional Christian democratic party in France during the Third Republic. Founded in 1924, it represented the trend of advanced French social Catholicism, while remaining a party embodying the ideology of centrism....

 (PDP), the main Christian democratic party in the rest of France at the time.

In the Chamber of Deputies

Chamber of Deputies of France

Chamber of Deputies was the name given to several parliamentary bodies in France in the nineteenth and twentieth centuries:* 1814–1848 during the Bourbon Restoration and the July Monarchy, the Chamber of Deputies was the Lower chamber of the French Parliament, elected by census suffrage.*...

, the UPR's parliamentarians sat with various groups from the centre-right and the right before forming, with the URL, the Republicans of the Centre

Republicans of the Centre

The Republicans of the Centre was a French parliamentary group in the 15th Chamber of Deputies of France during the French Third Republic between 1932 and 1936...

 in 1932 and the Independents of Popular Action

Independents of Popular Action

The Independents of Popular Action was a French parliamentary group in the 16th Chamber of Deputies of France during the French Third Republic between 1936 and 1940...

 in 1936.

The UPR, URL, and PDP merged in 1946 to the create the Popular Republican Movement

Popular Republican Movement

The Popular Republican Movement was a French Christian democratic party of the Fourth Republic...

(MRP).