Why was the passage of the voting rights act of 1965 a turning point in the civil rights movement?

The Voting Rights Act of 1965, signed into law by President Lyndon B. Johnson, 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.

I hope this helps, God bless, and have a great day!
Brainliest is always appreciated :)