The document discusses the foreign policy of the United States in three phases: before 1945, after 1945, and after 9/11. It outlines the major objectives and instruments of US foreign policy in each phase. Before 1945, the US pursued isolationism and focused on security, promoting ethical values, and individual liberty. After 1945, it abandoned isolationism due to the bipolar world, military developments, and ideological differences. It expanded alliances, provided foreign aid, used sanctions, pursued open markets and free trade. After 9/11, countering terrorism became a major focus, through objectives like bringing terrorists to justice and promoting democracy.