United States foreign policy actions have often been based on national self- interest. These actions have had immediate and long- term results. Two foreign policy actions that have demonstrated this are the Roosevelt Corollary and the Open door policy. The Roosevelt Corollary to the Monroe Doctrine expands upon President James Monroe’s statement that the western hemisphere is closed to further European colonization’s. It was told for all European countries to stay away from and out of the western hemisphere. Several European countries threatened Latin America countries. The U.S. then began to keep an eye on the finances of Latin American nations. One long term effect of this was that central and South American countries and people became very bitter, towards the United States because they believed they were being controlled by the United States. They felt the U.S. had too much interference in their business and that they were trying to control them. The negative effects promoted the nations self- interest because now without European interference in central and southern American. The United States could now get involved in the business and affairs of South American countries under the protection of them and have all the benefits that this would provide. The United States and investment in the central and South American countries benefitted them. So keeping everyone else out was definitely an action for national self-interest. The open door policy is principles initiated by the United States for the protection of equal privileges among countries trading with china. The