Enfranchise (verb)

1. To give the right to vote to (someone).
2. To grant the right to vote to someone, typically to a previously marginalized group.

Origin:

En- + franchise.

Examples:

1. The law enfranchised women.
2. The enfranchisement of the African American population was a long-fought battle.
3. The enfranchisement of the poor was a major reform.
4. He worked to enfranchise the minority.
5. The enfranchisement of the disabled was a significant achievement.