Why do states' rights supporters think more power should go to the states? What could be their fear?

- 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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where is the subject? hahahaha

this is a good question! i'll do some research and come back when i have the answer!