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Nevertheless, the annexation was completed on March 2, 1845. The only redeeming
feature for the Northerners was in the recognition of the compromise line of 36°
30', north of which slavery was prohibited. Otherwise, they were embittered, as
it also provided for the formation of more slave States, and for the first time
embodied in law the doctrine of squatter sovereignty. It was as follows:
New
States of convenient size, not exceeding four in number, in addition to the said
State of
Texas, and having sufficient population, may hereafter, by the consent
of the provisions of the Federal Constitution, and such States as may be formed
out of that portion of said territory lying south of thirty-six degrees and
thirty minutes north latitude, commonly known as the Missouri Compromise line,
shall be admitted into the Union with or without slavery, as the people of each
state asking admission may desire; and in such state or states as shall be
formed out of said territory north of said Missouri Compromise line,
slavery or
involuntary servitude (except for crime) shall be prohibited.
In
the war which followed, the North was subjected to the deeper humiliation of
fighting to win free territory from Mexico to increase the domain of
slaveholding
Texas. War with Mexico was declared on May 12, 1845 and
uninterrupted and continued victories followed the American armies. Soon, it
became evident that, however unjust the American cause, the United States would
speedily force Mexico into terms of submission.
The
proposed accession of territory forced the slavery question into notice in a new
form. Before this time, slavery laws had not been subject to question. In the
case of all territory previously acquired, except in the Virginia cession, it
had been plausibly and successfully contended that, slavery being established
and legalized already, it must be upheld until those immediately interested
should see fit to abolish it.
However, Mexico had utterly abolished slavery some twenty years before, and
every acre that she should cede to the United States, beyond the Rio Grande
River would come to as free soil. However, under this consideration in the case
of
Texas, all concessions were refused by the South, since, on the basis of this
doctrine, slavery was already in full possession, and should not be changed.
To
solve this debate, the Wilmot Proviso was introduced on August 8, 1846, in the
United States House of Representatives as a rider on a $2 million appropriations
bill intended for the final negotiations to resolve the Mexican-American War.
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