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The challenge is basically what it says in the title. After reading about former president J. Q. Adams' view on slavery, the annexiation of Texas and the Mexican War I wonder how it could be achieved that the northern states secede from the USA because of these events? Also: How much territory could the North claim and control? And what might it call itself?
The POD must be no earlier than 1822 (when the Old Three Hundred under Austin arrived in Texas).