What date was the date of the Grandfather clause so significant?

The Grandfather Clause, established in the late 19th century, was significant because it allowed certain individuals, particularly white voters, to bypass literacy tests and poll taxes that were ostensibly designed to restrict voting rights for African Americans. This clause effectively disenfranchised a large number of Black citizens while preserving voting rights for those whose grandfathers had been eligible to vote before the Civil War. Its implementation highlighted the systemic racism embedded in laws and policies during the Jim Crow era.