Why did urban areas develop subway, elevated train, and streetcar systems?

Hello there,

It is A. to make it possible for people to move around within cities

Explanation:

This is correct on edge (I appreciate Brainliest if you can)

- 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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