Why did some northerners object to dividing the Nebraska Territory in two? It would allow slavery to spread north of the line established by the Missouri Compromise.

The Wilmot Proviso had already settled the issue of slave and free states.

Douglas had already proposed the idea of allowing popular sovereignty in the territory.

Douglas had rejected the idea of splitting the region into two territories.

It would allow slavery to spread north of the line established by the Missouri Compromise.

Explanation:

In Stephen Arnold Douglas bid to divide regions of Nebraska and Kansas to invalidate the Missouri Compromise line, he proposed to divide the Nebraska Territory in two. However, some northerners objected to such action. The reason behind the objection is that the then northern part of the United States was generally anti-slavery and it is believed that such action would allow slavery to spread north of the line established by the Missouri Compromise.

It would allow slavery to spread north of the line established by the Missouri Compromise.

Explanation:

- "a new era of american politics began with jackson's election in 1828, but it also completed a grand social experiment begun by the american revolution. nevertheless, jacksonian democracy represented a provocative blending of the best and worst qualities of american society."

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d) a constitutional amendment