You've described chattel slavery, the most prominent form of slavery in USAmerican history, but not the only nor to my knowledge, most prominent form of slavery

You've described chattel slavery, the most prominent form of slavery in USAmerican history, but not the only nor to my knowledge, most prominent form of slavery in world history. Prison labor so sufficiently meets the definition of slavery that the authors of the 13th Amendment, ending chattel slavery, excluded prison labor as still allowed.