In his December 2, 1823 address before Congress, President James Monroe emphasized that the United States would seek to negotiate with other powers, especially with Britain, Spain and Russia -- the latter's claims over significant portions of the western coast along the Pacific were predicated upon its attempts to colonize those territories -- the proper adjudication of territorial disputes, but that the continental United States, as it then-existed, was not subject to such negotiations, and that European colonization of the Americas was no longer open to discussion:
"The Government of the United States has been desirous by this friendly proceeding of manifesting the great value which they have invariably attached to the friendship of the Emperor and their solicitude to cultivate the best understanding with his Government. In the discussions to which this interest has given rise and in the arrangements by which they may terminate the occasion has been judged proper for asserting, as a principle in which the rights and interests of the United States are involved, that the American continents, by the free and independent condition which they have assumed and maintain, are henceforth not to be considered as subjects for future colonization by any European powers."
What subsequently became known as "the Monroe Doctrine" has since that time been interpreted to mean the United States viewed the Americas as within its sphere of interests and that foreign -- read: European and Asian -- intervention in the Americas would contravene those U.S. interests. The Monroe Doctrine has, consequently, been used to define U.S. national interests and has served as a warning to other powers, mainly, to the Soviet Union during the Cold War and, potentially, to China in the not-too-distant future, that any military and political activities in the Americas should remain limited in scope, and that no actions taken in the Americas should constitute a threat to U.S. interests.