You can make an argument that Eisenhower was the best President of the last century, even though he was anathema to most conservatives of the era because he did not dismantle the New Deal. He erred in appointing Warren and Brennan to the Supreme Court, which he admitted was his worst mistake after he retired. Along with J. Edgar Hoover and Richard Nixon, Eisenhower did nothing to prevent the harsh attacks on Senator Joseph McCarthy by the Democrats. However, with those admitted flaws, the United States was at peace with other nations during his Administration. While we were still extensively involved overseas, we allowed the NATO allies, including West Germany, to carry a greater burden of the defense of Europe. The economy was strong, and the Eisenhower Administration did not add any major new regulatory burdens or social programs.
Yah, my list of the great Presidents of the 20th Century would be Reagan, Coolidge, and Eisenhower. That’s it.