Who expanded on voting rights?

I have two different answers.

1 african american

2 women

Explanation:

Before the civil war african americans were not allowed to vote cause of their color.

women were not allowed to vote until 1920

i think it was President Lyndon B. Johnson,

Explanation:

He aimed to overcome legal barriers at the state and local levels that prevented African Americans from exercising their right to vote as guaranteed under the 15th Amendment to the U.S. Constitution.