William Taft's accomplishments in office include expanding the parcel post service, creating the Department of Labor, breaking up monopolies and increasing of railroad regulation. During his presidency, two amendments were added to the Constitution and his "Dollar Diplomacy" increased America's influence abroad.
Taft expanded the U.S. Postal service by placing 35,000 postmasters and 20,000 skilled workers in the Navy under civil service protection.
Taft broke up twice as many trusts as his predecessor, Theodore Roosevelt, including Standard Oil and American Tobacco. Under his leadership, 90 antitrust suits were filed during his administration. Taft won a lawsuit against the American Sugar Refining Company, thus breaking up the "sugar trust" that rigged prices. He even moved to break up U.S. Steel, which garnered criticism from Roosevelt.
He encouraged the passage of the 16th Amendment, giving the United States the income tax system. He also pushed the passage of the 17th Amendment that allowed citizens to directly elect senators.
With his backing, Congress enacted the Mann-Elkins Act of 1910, empowering the Interstate Commerce Commission to suspend railroad rate hikes and to set rates.
His idea of "Dollar Diplomacy" strengthened security for the Panama Canal, increased American trade and diminished the presence of European nations by arranging loans to Latin American countries for infrastructure improvement.