Which region was added in 1846 and established the 49 degree parallel as the border

The 14th amendment overruled the supreme court case of dred scott vs. sandford. the landmark supreme court case determined which of the following points? a.slaves could not be citizens b.non-landowners could not be citizens c.blacks could not be citizens d.all persons born or naturalized in the united states vary differently in citizen status.

What country aided north korea in the korean war?

True or false: abraham lincoln delayed the emancipation proclamation to make sure the border states would stay loyal. *