What happened after an agreement upon slavery and the expansion could not be reached between the northern and southern states?

a) the southern states began to consider succession.
b) the government decided to go to war with mexico.
c) the nation took steps towards electing another president.
d) the government took measures to revise the us constitution.

- 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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a phrase from a poem by ralph waldo emerson about the battle of lexington and concord. emerson's words read, “here once the embattled farmers stood / and fired the shot heard round the world.”