To support the effective mobilization of domestic resources, the U.S. Agency for International Development (USAID) works closely with other U.S. Government partners, including the U.S. Department of Treasury, the Millennium Challenge Corporation, and the U.S. Department of State. The International Monetary Fund, the World Bank, the Organization for Economic Co-operation and Development, and many bilateral and multilateral donors are important partners in this effort. Collectively, this international support helps governments and their revenue agencies to expand their tax bases, reduce tax evasion, and tap new and underutilized sources of taxation.