The partisan realignment in the South is a well-known fact. The 20th century began with the South solidly in the hands of the Democratic Party. This was true because the Southern Democratic Party look positions congruent with the Southern electorate's public policy preferences: namely, a states-centered view of government and an opposition to more egalitarian racial Policy.
Petrow, Gregory A., "National Survey Shows Half-Century Trend Away From Democrats" (2002). Political Science Faculty Publications. 10.