Why did southern states adopt a grandfather clause?

Southern states adopted grandfather clauses as a way to circumvent the 15th Amendment and suppress the voting rights of African Americans following the Reconstruction era. These clauses allowed individuals to vote only if their grandfathers had been eligible to vote before the Civil War, effectively disenfranchising many Black citizens whose ancestors had been enslaved and denied the right to vote. This legal loophole aimed to maintain white supremacy in the electoral process while creating the illusion of fairness. Ultimately, grandfather clauses contributed to the broader system of Jim Crow laws that enforced racial segregation and discrimination.