Plsss help Worth a lot of points

15) To aid their trading with Native Americans.

16) Mississippi River and St. Lawrence River

17) Fort Maurepas

18) Spain. France regained it in 1803.

19) He sold it to the United States.

20) Detroit, New Orleans, Baton Rouge

Explanation:

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.