What are the constructional restrictions on the power of the stages to set voting qualifications?

The constructional restrictions on the power of the states to set voting qualifications stem primarily from the U.S. Constitution and Federal Laws. The Constitution prohibits states from denying the right to vote based on race, color, or previous condition of servitude (15th Amendment), sex (19th Amendment), and age for those 18 years and older (26th Amendment). Additionally, the Voting Rights Act of 1965 further restricts states from implementing discriminatory practices that could disenfranchise voters. Consequently, while states have some authority to determine voting qualifications, they must do so within the framework established by federal law and constitutional provisions.