Is slavery legal in the USA? Also, is it slavery if you are forced to work to pay a debt, or go to jail, or even if you cannot pay the debt?

255,000 people (mostly men) are in jail or prison for not paying debt.
255,000 people (mostly men) are in jail or prison for not paying debt.
Is slavery legal in the USA? Also, is it slavery if you are forced to work to pay a debt, or go to jail, or even if you cannot pay the debt?
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