The major cause of "dead zones" in seas and oceans is?

After the supreme court’s ruling on the dred scott case, many people in the north believed that a. slavery might become legal everywhere. b. slavery might be banned everywhere. c. formerly enslaved people would move to the north. d. formerly enslaved people would stay in the south.

Why do the soldiers board the grounded boat

In 150 to 200 words, use evidence to compare the ideas of the abolition of the slave trade and the abolition of slavery