Why do states and not the federal government set qualifications for voting?

States set qualifications for voting due to the U.S. Constitution, which grants them the authority to regulate the administration of elections within their borders. This includes determining voter registration processes and eligibility criteria, allowing states to tailor their policies to reflect local values and needs. While the federal government establishes certain overarching protections, such as the Voting Rights Act, states retain primary control over the electoral process. This decentralized approach aims to balance local governance with federal oversight.