Final answer:
The Progressive Era was a period of social reform in the United States, driven by grassroots efforts and supported by federal legislation. Muckraking journalists played a crucial role in exposing social inequality and inspiring Americans to take action.
Step-by-step explanation:
The Progressive Era, which took place at the beginning of the 20th century, was a period of intense social reform in the United States. It was a time when ordinary people and activists tried to address various societal problems through action. The Progressive Era saw grassroots efforts at the state and local levels, as well as significant reforms at the federal level, such as the regulation of trusts and monopolies, consumer safety legislation, labor reforms, and the creation of the National Park Service. The movement was driven by muckraking journalists who exposed social inequality and inspired Americans to take action.