What problem did the Kansas–Nebraska Act pose for the United States? The act intensified the issue over slavery in the United States Congress. The act called for a gradual end to slavery in the South. The act allowed for African Americans to vote in presidential elections. The act resolved the conflicts between the slave and free states.

The act intensified the issue over slavery in the United States Congress.

Explanation:

The Kansas-Nebraska Act of 1854 allowing settlers of a region to decide whether slavery to be approved within a new state's borders, and allowed for popular sovereignty. It also led to a violent rebellion called Bleeding Kansas. It was a rebel between antislavery and proslavery activists who flooded into the territories.

- 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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your answer would be (b)