Question

why were northerners upset about the dred scott decision? it upheld the missouri compromise. it said that slavery could become legal everywhere. it stated that only congress could ban slavery. it reinforced the fugitive slave act.

Explanation:

The Dred Scott decision ruled that Congress had no power to ban slavery in federal territories. This meant slavery could potentially spread everywhere, which upset Northerners who opposed slavery's expansion. The Missouri Compromise was declared unconstitutional (so option A is wrong). The decision said Congress couldn't ban slavery (contradicting option C). While the Fugitive Slave Act was a separate issue, the main upset for Northerners was the potential for slavery's widespread legality as per the Dred Scott decision (making option D less relevant compared to B).

Answer:

B. It said that slavery could become legal everywhere.