Why was the voting rights act of 1965 a pivotal moment in the civil rights movement?

The voting rights act of 1965 was a pivotal movement as it overcame the legal barriers at state and local level that prevented African Americans to vote.

Explanation:

Voting right; Act of 1965 was pivotal movement in civil rights movement as:  

It outlawed the discrimination prevailing in practice of voting. One of them being literacy rate as the prerequisite for voting.  It overcame legal provisions that prevented African Americans from their voting right. Aimed to register all African Americans in the voting lists so that they can gain political power.

What are the statements?