Why was the literacy level so high in new england?

Gettysburg address question. what is the best line from the address? why do you think so?

The united states constitution gives the the power to regulate interstate commerce.

Which of these was not a key difference between northern and southern states at the constitutional convention? wanting to protect states’ interests vs. a government with strict rules having more, larger cities vs. having fewer, smaller cities wanting to protect agriculture vs. protect industries having many enslaved people vs. using less enslaved labor