"a hundred years of Jim Crow" Courtesy of the Democrats:

The rise and fall of Jim Crow

After the Civil War, white Southerners opposed Radical Reconstruction and the Republican Party's support of black civil and political rights.

The Democratic Party identified itself as the "white man's party" and demonized the Republican Party as being "Negro dominated," even though whites were in control. Determined to re-capture the South, Democrats "redeemed" state after state -- sometimes peacefully, other times by fraud and violence. By 1877, when Reconstruction was officially over, the Democratic Party controlled every Southern state.         

The South remained a one-party region until the Civil Rights movement began in the 1960s. Northern Democrats, most of whom had prejudicial attitudes towards blacks, offered no challenge to the discriminatory policies of the Southern Democrats.

After the Civil War, the Democratic Party in the South was the party of white supremacy. Now, African Americans form the party's most loyal base of support. One of the consequences of the Democratic victories in the South was that many Southern Congressmen and Senators were almost automatically re-elected every election. Due to the importance of seniority in the U.S. Congress, Southerners were able to control most of the committees in both houses of Congress and kill any civil rights legislation. Even though Franklin Delano Roosevelt was a Democrat, and a relatively liberal president during the 1930s and '40s, he rarely challenged the powerfully entrenched Southern bloc. When the House passed a federal anti-lynching bill several times in the 1930s, Southern senators filibustered it to death.