The breaking apart of a union; separation of people, groups, or regions that were joined together.
From dis- (separation) + union (from Latin 'unus' one), specifically referring to the dissolution or rupture of a previously unified whole, especially countries or organizations.
In American history, 'disunion' was the charged word slaveholders used before the Civil War—it meant dissolving the United States itself, making it one of the most powerful and dangerous words of the 1850s.
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