How did white Americans keep black Americans from voting?

They made sure that no black person, nor woman, would be able to put their votes in the box.

The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any state on account of race, color, or previous condition of servitude.

Explanation: This unfair treatment was debated on the street, in the Congress and in the press. A full fifty years after the Fifteenth Amendment passed, black Americans still found it difficult to vote, especially in the South.

first second and third

explanation:

i beleive that d is the right answer