Hence, the act of Congress, purporting to continue the Maryland laws respecting slavery in this District, was, and is, and forever must be, until the constitution is altered, null and void.
Editor's note · Context
Mann declares the act of Congress maintaining slavery in the District as unconstitutional and void.
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No man of common sense, who has observed this result, can doubt for a moment that the system of free labor promotes the growth and prosperity of states in a much higher degree than the system of slave labor.
Even cold, barren New England, though more than twice as thickly peopled, grew in population at a faster rate than these old slave states.
But the impious hand of man divorces these twin capacities, wherever it denies knowledge.
This is the reciprocity of slave law.--to be forever liable to be proved guilty, but never able to prove himself innocent; to be subject to all punishments, but, through his own oath, to no protection.





