The counties map of Mississippi in 1952 was the opposite of the maps of the recent times. Eisenhower won the counties of the black belt. Maybe, the few blacks who could vote in Mississippi voted for Eisenhower.
It's more likely that blacks in Mississippi were prevented from voting, which you'll see reflected in the raw vote totals in those black belt counties. What this tells us is that the whites who lived in majority-black communities were voting for Eisenhower.
While probably true, there's pretty good evidence that Blacks who could vote in the South voted slightly to the right of Blacks in the North for quite a while.
You mean more Republican? Only Texas and parts of TVA country had any sort of progressive movement in that period.
