A common explanation is that the Civil War was fought over the moral issue of slavery. In fact, it was the economics of slavery and political control of that system that was central to the conflict.
The Declaration of Independence was organized into five distinct segments with each segment addressing a particular issue.
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The intented meaning behind Kaufman's use of understatement in relation to American drama is to show how the British act in serious situations. He is simply making fun of them and the way they behave. Kaufman is parodying British manners through the unconcerned characters.
B - Some communities closed their schools rather than to integrate.
While some in the the south did not want to integrate their schools, some communities refused (but not most) and they figured out plans to delay integration, transfer students to different schools and close others.