Which event or individual that we have covered in U. S. history do you believe has had the greatest impact on the history of the United States?

In my opinion that is George Washington.

Explanation:

In my opinion George Washington is one of the most important figures in the history of United States. First president of United States, he was a general and leader of Revolutionary Army and the war hero of the same. As a president and as a general he contributed a lot to the creation of United States. In my opinion United States wouldn't be what they are today without him.

d.

the northwest territory became the most densely populated area in the u.s.