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the 13th amendment because it abolished slavery and freed the  slaves.

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It was important to the U.S.because  the south went back to the U.S. and had to change their constitution

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It helped African Americans because the 15 amendment gave them the right to vote.

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They made the 13th, 14th ,15th Amendment
Every time there was a new constitution  the needed to have all 3 of those amendments

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It was called the black code.
It was for former slaves that didn't have a job they would get arrested.