The conflict which is taking place in America at the same time as the Franco-Mexican conflict has become an American civil conflict.
The American Civil War became a civil conflict within the United States among the Union states that remained unswerving to the federal union, or "the North" and the Confederacy.
The primary reason for the conflict became the popularity of slavery, particularly the enlargement of slavery into territories received due to the Louisiana Purchase and the Mexican–American War.
On the eve of the Civil War in 1860, 4 million of the 32 million Americans had been enslaved black people, nearly all within the South.
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