Harry S. Truman ( May 8 , 1884 - December 26 , 1972 ) was the 33rd President of the United States , from 1945 to 1953 . Harry S. Truman ( May 8 , 1884 - December 26 , 1972 ) was the 33rd President of the United States ( 1945 â `` 1953 ) .