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

Athe return of the Republican Old Guard
Bthe ascent of progressive politicians
Crising support for the Democrats
Da split in the Democratic Party

Verified Answer :

"A split in the Democratic Party" was one reason among the choices given in the question that transformed U.S. politics in the 1920s. The correct option among all the options that are given in the question is the fourth option or option "D". I hope that this is the answer that has come to your great help.

I believe the answer is: d.. a split in the Democratic Party

The split of democratic party in 1920 was driven by various cultural issues, one of the biggest issue was whether they should prohibit the Ku Klux Klan. This conflict create a massive divide in votes within the democratic party, which opened up a huge path of the Republican party to seize victory in the presidential election.