In the reservation system, american indian tribes were confined to assigned land with
defined borders.
flexible borders.
unknown borders.
natural borders.

- 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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he sent troops to protect the students as they entered the school.