During the start of the Cold War, the U.S. Republican Party experienced internal debates over which regions of the world the U.S. should prioritize. The Trans-Atlanticist Republicans, such as Senator Arthur Vandenberg, favored prioritizing Europe’s security from Soviet expansion. They supported the Truman Administration’s Marshall Plan to rebuild Europe and establish the NATO Alliance. The “Asia First” Republicans, such as Senator Bob Taft, advocated for the U.S. to focus on confronting communism in Asia. These Republicans criticized President Truman for excessive involvement in Europe...