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Tuniss
It was the passage of the fifteenth amendment giving everyone the right to vote but no mention of woman the right to vote. 
melisarevilla

Answer:

Hi!

The answer to your question is the passage of the Fifteenth Amendment.

Explanation:

Passed by Congress February 26, 1869, and signed in 1870, the 15th was established to grant African American men the right to vote.

Because of this, women also organized suffrage groups in order to get the right to vote.