When President McKinley was assassinated and Theodore Roosevelt took office in 1901, progressivism became a powerful national movement. During his tenure as president, Roosevelt was a loud and effective advocate for “trust-busting,” the breaking up of enormous monopolies that had controlled prices and prevented competition. He also advocated for fair trade and pro-labor laws, including a decreased workweek, child labor restrictions, and workplace safety rules.  Roosevelt, returning power to the White House not seen since Abraham Lincoln, set the stage for William H. Taft and Woodrow Wilson to continue the legacy of progressivism - that is, until World War I broke out.