“Another powerful tool to stop African Americans from having any political voice was the white primary. Key to the white primary effectiveness was the fact that from Reconstruction until 1968 the South was a one-party system⁠—only Democrats needed apply, so despised was the party of Lincoln. Several of the states, therefore, began to discern that one way to skirt around the Fifteenth Amendment was to tinker with the primary election, during which the Democratic candidate was chosen.”