1916 Wilson (D) and Hughes (R) both liberal
1924 Davis (D) and Coolidge (R) both conservative
1940 FDR (D) and Willkie (R) both liberal
1944 FDR (D) and Dewey (R) both liberal
1948 Truman (D) and Dewey (R) both liberal
1952 Stevenson (D) and Eisenhower (R) both liberal
1956 Stevenson (D) and Eisenhower (R) both liberal
1960 JFK (D) and Nixon (R) both liberal
1976 Carter (D) and Ford (R) both conservative
It's not real complicated. The nation became significantly more conservative after 1965 and Southern Democrats progressively became Republicans at all levels to the point where mostly all Southern elected officials became Republican.
Eisenhower was not liberal, and it's laughable to say Carter was a conservative.
Carter was responsible for getting the deregulation ball rolling. He also believed that budget deficits created inflation. His 1980 budget called for increased military spending and tax cuts.
"" mostly all Southern elected officials became Republican."""
Not true at all. They were replaced by GOPers but most didnt become Republican