protected
and encouraged the slave trade to the colonies. Negro slavery in all
the colonies had thus passed from custom to law before the American
Revolution broke out; and the course of the Revolution itself had little
or no effect on the system.
From the beginning, it was evident that the course of slavery in the two
sections, North and South, was to be altogether divergent. In the colder
North, the dominant race found it easier to work than to compel negroes
to work: in the warmer South, the case was exactly reversed. At the
close of the Revolution, Massachusetts led the way in an abolition
of slavery, which was followed gradually by the other States north of
Virginia; and in 1787 the ordinance of Congress organizing the Northwest
Territory made all the future States north of the Ohio free States.
"Mason and Dixon's line" and the Ohio River thus seemed, in 1790, to be
the natural boundary between the free and the slave States.
Up to this point the white race in the two sections had dealt with
slavery by methods which were simply divergent, not antagonistic. It was
true that the percentage of slaves in the total population had been
very rapidly decreasing in the North and not in the South, and that the
gradual abolition of slavery was proceeding in the North alone, and that
with increasing rapidity. But there was no positive evidence that the
South was bulwarked in favor of slavery; there was no certainty but that
the South would in its turn and in due time come to the point which the
North had already reached, and begin its own abolition of slavery. The
language of Washington, Jefferson, Madison, Henry, and Mason, in regard
to the evils or the wickedness of the system of slavery, was too strong
to be heard with patience in the South of after years; and in this
section it seems to have been true, that those who thought at all upon
the subject hoped sincerely for the gradual abolition of slavery in
the South. The hope, indeed, was rather a sentiment than a purpose, but
there seems to have been no good reason, before 1793, why the sentiment
should not finally develop into a purpose.
All this was permanently changed, and the slavery policy of the South
was made antagonistic to, and not merely divergent from, that of the
North, by the invention of Whitney's saw gin for cleansing cotton
in 1793. It had been known, before that year, that cotton could be
cultivated in the South, but its cultivation was made unprofitable
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