Question: how and for what reasons did united states foreign policy

title: Foreign policy of the United States
text: After it captured the islands from Japan during World War II , the United States administered the Trust Territory of the Pacific Islands from 1947 to 1986 ( 1994 for Palau ) . The Northern Mariana Islands became a U.S. territory ( part of the United States ) , while Federated States of Micronesia , the Marshall Islands , and Palau became independent countries . Each has signed a Compact of Free Association that gives the United States exclusive military access in return for U.S. defense protection and conduct of military foreign affairs ( except the declaration of war ) and a few billion dollars of aid . These agreements also generally allow citizens of these countries to live and work in the United States with their spouses ( and vice versa ) , and provide for largely free trade . The federal government also grants access to services from domestic agencies , including the Federal Emergency Management Agency , National Weather Service , the United States Postal Service , the Federal Aviation Administration , the Federal Communications Commission , and U.S. representation to the International Frequency Registration Board of the International Telecommunication Union . Further