Which north american geographic feature was not formed by retreating glaciers during the last ice age?
a. niagara falls
b. the grand canyon
c. the great lakes
d. the upper mississippi river

I believe the answer is C.

The correct answer is "B" the Grand Canyon

Explanation:

so, pretty much all the features in Canada were formed by the last glaciation period.soi say

c, because the american revolution was from 1765 to 1783.

"the attempts of the proletariat to rise above this abasement"