From Wikipedia: Disfranchisement after the Reconstruction era

Worth a look as we get into the political institutions, and life after the rebellion.

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Disfranchisement after the Reconstruction era[2] in the United States, especially in the Southern United States, was based on a series of laws, new constitutions, and practices in the South that were deliberately used to prevent black citizens from registering to vote and voting. These measures were enacted by the former Confederate states at the turn of the 20th century. Efforts were made in Maryland, Kentucky, and Oklahoma.[3] Their actions were designed to thwart the objective of the Fifteenth Amendment to the United States Constitution, ratified in 1870, which prohibited states from depriving voters of their voting rights on the basis of race.

The laws were frequently written in ways to be ostensibly non-racial on paper (and thus not violate the Fifteenth Amendment), but were implemented in ways that purposely suppressed black voters. Beginning in the 1870s, whites used violence by domestic terrorism groups (such as the Ku Klux Klan), as well as fraud, to suppress black voters. After regaining control of the state legislatures, Southern Democrats were alarmed by a late 19th-century alliance between Republicans and Populists that cost them some elections.

After achieving control of state legislatures, white added to previous efforts and achieved widespread disfranchisement by law: from 1890 to 1908, Southern state legislatures passed new constitutions, constitutional amendments, and laws that made voter registration and voting more difficult, especially when administered by white staff in a discriminatory way. They succeeded in disenfranchising most of the black citizens, as well as many poor whites in the South, and voter rolls dropped dramatically in each state. The Republican Party was nearly eliminated in the region for decades, and the Southern Democrats established one-party control throughout the Southern United States.