How were the politics in the 1920s shaped by World War I?

Explanation:

The end of the First World War in 1918 was a time of great social and economic transition that led directly to what made the 1920's “The Roaring Twenties.” ... Technological advancements, urbanization, and immigration led directly to the social upheavals of the 1920s.

c) troops march forward in close formation against newer, more accurate weapons

the treaty of brest-litovsk was a peace treaty signed on 3 march 1918 between the new bolshevik government of russia and the central powers (german empire, austria-hungary, bulgaria, and the ottoman empire), that ended russia's participation in world war i.