Final answer:
Taft angered Progressives in the Republican party by endorsing the Payne-Aldrich Act, creating the U.S. Chamber of Commerce, and supporting conservative party candidates in elections.
Step-by-step explanation:
Taft angered Progressives in the Republican party by endorsing the Payne-Aldrich Act of 1909, which raised tariff rates instead of reducing them as promised. Additionally, Taft created the U.S. Chamber of Commerce, seen by many as a move against the labor union movement.
Furthermore, Taft supported conservative party candidates in the 1910 House and Senate elections, further distancing himself from the Progressives.