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:

general allotment act (dawes act) february 8, 1887

amendment to the dawes act, february 28, 1891

commission to the five civilized tribes (dawes commission), march 3, 1893