During the first phase of the American Revolution, most major battles took place near the cities of Boston, New York and Philadelphia. Why would controlling this region have been an important goal for both sides in the war?

These regions were all Major ports and couldve been used to transport arms, gunpowder, resources and more for both sides.

Explanation:

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.

interdependence is when all participating groups and individuals depend on each other. if you depend on one anothers goods, you end up trading in order to get the items you're looking for. (for ex: if i have food and you have water, we trade in order to depend on each other to live)