I love posting this and everytime you ask you will get the same answer:

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"In 1860 South Carolina seceded alone from the old union of States. Her people, in Convention assembled, invited the slaveholding States (none others) of the old Union to join her in erecting a separate Government of Slave States, for the protection of their common interests. All of the slave states, with the exception of Maryland and Kentucky, responded to her invitation. The Southern Confederacy of slave States was formed. "