مبدأ مونرو
Despite the United States' beginnings as an isolationist country, the foundation of the Monroe Doctrine was already being laid even during George Washington's presidency. According to S.E. Morison, "as early as 1783, then, the United States adopted the policy of isolation and announced its intention to keep out of Europe. The supplementary principle of the Monroe Doctrine, that Europe must keep out of America, was still over the horizon".