Describe how trade contributed to the United States territorial growth

As far i know by imposing a tax (or tariff if you wanna be fancy) on imported goods. This was to make imported items more expensive than domestically produced ones. A high tax was popular in the north, as protecting American jobs and making northern manufacturers wealthy. It was bitterly resented in the south. The south traded a lot with Europe, particularly France and England.

I believe that trade brought wealth and good connections and potentially allies in times of war for new lands.