Which early-19th century expansion nearly doubled the size of the united states?

are these the benchmarks questions?

- 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."

< 3

d) he bring down boss tweed and tammany hall.

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