What significant reform movement was prevalent during Theodore Roosevelt's presidency?

The significant reform movement that was prevalent during Theodore Roosevelt's presidency was environmental conservation. Roosevelt is often credited with being a pioneer in the modern conservation movement, taking substantial steps to protect the natural environment. He established numerous national parks, forests, and wildlife refuges, significantly expanding the federal government's role in preserving the nation's natural resources. This effort included the establishment of the Antiquities Act, which allowed him to designate national monuments, and the creation of the United States Forest Service, focusing on sustainable management of forests.

While other movements, such as labor rights, women's suffrage, and civil rights, were also important during this period, they did not receive the same level of direct focus from Roosevelt's administration as environmental conservation did. His legacy in conservation established a foundation for ongoing environmental policies and awareness that resonates to this day.