The correct answer is the Progressive Party.
The Progressive Party, formed in 1912, is considered a splinter party. This is because the Progressive Party consisted of members that broke away from the Republican Party during this era. Thanks to the efforts of Teddy Roosevelt, thousands of Republicans left the party and joined Roosevelt in his efforts to win the presidency again in 1912. However, this splinter party was short lived as Roosevelt was easily defeated by Woodrow Wilson in the presidential election of 1912.