Under the laws of Maryland, he might have held his slave, for her statutes had legalized slavery; but under the constitution of the United States, he could not hold a slave; for that constitution had given Congress no power to legalize slavery in this District, and had gone so far as to make prohibitions against it.
Editor's note · Context
Mann argues that the U.S. Constitution does not grant Congress the power to legalize slavery in the District of Columbia.
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