In order to extend the civil rights of slaves after the Civil War, the United States

In order to extend the civil rights of slaves after the civil war, the United States banned slavery with the Thirteenth Amendment of 1865 and created new protections with the Fourteenth Amendment of 1868. With the Fifteenth Amendment of 1870, the right of vote could not be denied on account of race or color.

d

explanation:

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the answer is "focused on"

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