1790, the United States was heavily in debt from paying for the American Revolution.
forming Congress.
trading with Great Britain.
forming the executive branch.

Paying for the American Revolution

Explanation:

While the trade with Britain was a nuisance to many Americans at this time, it did not cause the United States to go in debt, and neither did the formation of any sort of government branch or house. The American Revolution required a massive amount of resources and cost a lot of money.

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.