The power of political machines declined during the period of Progressive Era.
Answer: Option C
Step-by-step explanation:
In U.S. political machines have dominated the politics for some time. They were party organisations managed by a single person called as boss or a small group of people. They were responsible for the administrative as well as political control over the city or county.
Citizens have condemned corruption in American urban policy. They implemented national and state reforms and tried to replace the local care system with civil servants. In the period of Theodore Roosevelt, the progressive era gathered millions of citizens who voted against machines. So, there was downfall in the power of these political machines.