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Answer:
The American Civil War (April 12, 1861 – May 9, 1865, also known by other names) was a civil war in the United States fought between northern and Pacific states ("the Union" or "the North") and southern states that voted to secede and form the Confederate States of America ("the Confederacy" or "the South").[e] The central cause of the war was the status of slavery, especially the expansion of slavery into newly acquired land after the Mexican-American War.
The legal segregation , was the A,The laws.
This was normally used in Southern States. Permitting legal segregation!
I hope this helps you!
The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.