To find books on relations of the United States with other countries or regions, check the Library Catalog, using SUBJECT begins with
United States Foreign Relations [Country/Region Name]
For example: united states foreign relations afghanistan
Chronological History of U.S. Foreign Relations. Lester H. Brune. 2d edition. New York : Routledge, 2003. 3 vols.
Chronology of events relevant to U.S. relations with other nations as well as events in other countries that influenced American decisions. v. 1.1607-1932 -- v. 2. 1933-1988 -- v. 3. 1989-2000. Vol. 3 includes an analytical index. For example
Dana Call Number: Ref. E183.7.B745 2003