But instead of the sounder parts diffusing healthful influences, and gradually eradicating the disease, the diseased parts have shot their infection through all the veins and organs of the body politic, until, from the heart to the extremities, there is not now to be found an uncontaminated spot.
Editor's note · Context
Mann uses a metaphor to describe how the spread of slavery has infected the entire political system of the United States.
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