Up until 1944, it was lawful for states to allow racial segregation in primary elections.
Texas was - until recently - a one party state. No Republican party existed until the early 1960s, so the only competition was in the Democratic primary election. The state allowed the party to exclude Black voters, which effectively disenfranchised them.
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White primaries were primary elections held in the Southern United States in which only white voters were permitted to participate. Statewide white primaries were established by the state Democratic Party units or by state legislatures in South Carolina (1896), Florida (1902), Mississippi and Alabama (also 1902), Texas (1905), Louisiana and Arkansas (1906), and Georgia (1908). The white primary was one method used by white Democrats to disenfranchise most black and other minority voters. They also passed laws and constitutions with provisions to raise barriers to voter registration, completing disenfranchisement from 1890 to 1908 in all states of the former Confederacy.
The Texas Legislature passed a law in 1923 that allowed political parties to make their own rules for their primaries. The dominant Democratic Party banned black and hispanic minorities from participating. The Supreme Court, in 1927, 1932, and 1935, heard three Texas cases related to white primaries. In the 1927 and 1932 cases, the Supreme Court ruled in favor of the plaintiff, saying that state laws establishing a white primary violated the Fourteenth Amendment. Later in 1927 Texas changed its law in response, delegating authority to political parties to establish their own rules for primaries. In Grovey v. Townsend (1935), the Supreme Court ruled that this practice was constitutional, as it was administered by the Democratic Party, which was a private, not a state institution.
In 1944, the Supreme Court ruled 8–1 against the Texas white primary system in Smith v. Allwright. In that case, the Court ruled that the 1923 Texas state law was unconstitutional, because it allowed the state Democratic Party to racially discriminate. After the case, most Southern states ended their selectively inclusive white primaries. They retained other devices of disenfranchisement, particularly in terms of barriers to voter registration, such as poll taxes and literacy tests. These generally survived legal challenges as they applied to all potential voters, but in practice they were administered in a discriminatory manner by white officials. Although the proportion of Southern blacks registered to vote steadily increased from less than 3 percent in 1940 to 29 percent in 1960 and over 40 percent in 1964, gains were minimal in Mississippi, Alabama, North Louisiana and southern parts of Georgia before the Voting Rights Act.