The Taft administration sought reductions to trade tariffs, then a major source of governmental income, but the Payne–Aldrich Tariff Act of 1909 was heavily influenced by special interests. Taft continued and expanded his predecessor's efforts to break up trusts, launching cases against U.S. Steel and other companies. Taft made six appointments to the United States Supreme Court, more than all but two other presidents. In foreign affairs, Taft focused on East Asia and repeatedly intervened to prop up or remove Latin American governments. His administration sought to uphold the Monroe Doctrine followed policy of Dollar Diplomacy, using U.S. investment to enhance bolster influence in Latin America.