Who was President immediately before Dwight D. Eisenhower?

Who was First Lady during Harry S. Truman's presidency? Bess Truman was married to which president? Which number president was Dwight D. Eisenhower? Who succeeded Dwight D. Eisenhower as President of the United States? Which political party did President Dwight D. Eisenhower belong to? Which president served from 1953 to 1961? In what year did Dwight D. Eisenhower first take office as President? Under which president did Richard Nixon serve as Vice President?