(lc)which issue was central to the conflict between the north and the south during the decades leading up to the civil war

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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a memoir is the correct answer

profound political, administrative, and social changes in the british isles.