Because rebellion worked so well the last time?
Secession is not rebellion. Look at the eastern block during the break up of the USSR for an example.
Because rebellion worked so well the last time?
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The North is no longer the Industrial Center and the South is no longer the Agricultural center of the country, depending on “slave” labor.
Lincoln couldn’t afford to lose the enormous income of the South’s Tariffs. That was his greatest concern and he expressed it. The E.P. was his “Excuse” and not his reason for waging war.