A policy of containment was adopted to limit Soviet expansion, and a series of proxy wars were fought with mixed results.
In 1991, the Soviet Union dissolved into separate nations, and the Cold War formally ended as the United States gave separate diplomatic recognition to the Russian Federation and other former Soviet states.
But the rival Jeffersonians feared Britain and favored France in the 1790s, declaring the War of 1812 on Britain. Over time, other themes, key goals, attitudes, or stances have been variously expressed by Presidential 'doctrines', named for them.
Initially these were uncommon events, but since WWII, these have been made by most presidents.
The President is also Commander in Chief of the United States Armed Forces, and as such has broad authority over the armed forces.
The officially stated goals of the foreign policy of the United States, including all the Bureaus and Offices in the United States Department of State, as mentioned in the Foreign Policy Agenda of the Department of State, are "to build and sustain a more democratic, secure, and prosperous world for the benefit of the American people and the international community." In addition, the United States House Committee on Foreign Affairs states as some of its jurisdictional goals: "export controls, including nonproliferation of nuclear technology and nuclear hardware; measures to foster commercial interaction with foreign nations and to safeguard American business abroad; international commodity agreements; international education; and protection of American citizens abroad and expatriation." Subject to the advice and consent role of the U. Senate, the President of the United States negotiates treaties with foreign nations, but treaties enter into force if ratified by two-thirds of the Senate.Much of the American war effort went to strategic bombers, which flattened the cities of Japan and Germany. Almost immediately, however, the world witnessed division into broad two camps during the Cold War; one side was led by the U. and the other by the Soviet Union, but this situation also led to the establishment of the Non-Aligned Movement.This period lasted until almost the end of the 20th century and is thought to be both an ideological and power struggle between the two superpowers.The 1803 Louisiana Purchase doubled the nation's geographical area; Spain ceded the territory of Florida in 1819; annexation brought in the independent Texas Republic in 1845; a war with Mexico in 1848 added California, Arizona, Utah, Nevada, and New Mexico. Victory over Spain in 1898 brought the Philippines, and Puerto Rico, as well as oversight of Cuba.The short experiment in imperialism ended by 1908, as the U. turned its attention to the Panama Canal and the stabilization of regions to its south, including Mexico.
As a result of intense internal debate, the national policy was one of becoming the Arsenal of Democracy, that is financing and equipping the Allied armies without sending American combat soldiers.