What transformed U. S. politics in the 1920s?

A. the return of the Republican Old Guard

B. the ascent of progressive politicians

C. rising support for the Democrats

D. a split in the Democratic Party

The reason that transformed U. S Politics in the 1920s is the ascent of progressive politicians. The correct answer is option B. This period was known as the Progressive Era. This transformed the U. S Politics because its aim was to eliminate the corruption in the government.