Theodore Roosevelt became president in 1901 after William McKinley was assassinated. As president, Roosevelt supported progressive goals and established a reputation as a "trustbuster" by using the Sherman Antitrust Act to break up large trusts like Northern Securities Company and Standard Oil that took advantage of workers and limited competition. He also sided with striking miners against mine owners and took action to conserve natural resources by establishing the U.S. Forest Service and setting aside land for national parks. Roosevelt did not run for re-election in 1908 and supported William Howard Taft, but later broke from Taft to run as the Progressive Party candidate in 1912, splitting the Republican vote and allowing Woodrow Wilson to win the presidency.