Arthur Hendrick Vandenberg ( March 22 , 1884April 18 , 1951 ) was an American politician who served as a United States Senator from Michigan from 1928 to 1951 . A member of the Republican Party , he participated in the creation of the United Nations . He is best known for leading the Republican Party from a foreign policy of isolationism to one of internationalism , and supporting the Cold War , the Truman Doctrine , the Marshall Plan , and NATO . He served as President pro tempore of the United States Senate from 1947 to 1949
participated
United Nations Conference on International Organization
Arthur Vandenberg