1. in the nineteenth-century, how was the united
states beginning to change?

it was the begging of the end of slavery

Explanation:

during the Civil War, north side and south of america fought to end Slavery and bring the Confederacy back into the Union and was led by Abraham Lincoln.

- "the four new england colonies of colonial america included colonies of new hampshire, massachusetts bay colony, rhode island and connecticut."

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- 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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