What challenges did the US have to confront after the Civil War ended?

Explanation:

The most difficult task confronting many Southerners during Reconstruction was devising a new system of labor to replace the shattered world of slavery. The economic lives of planters, former slaves, and nonslaveholding whites, were transformed after the Civil War.

- "it was a failure that was an embarrassment for the kennedy administration."

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the correct answer is d