What was the real result of the fifteenth amendment?

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What makes fort sill historically unique among other regional military installations? a. it is the site where seven major commanders of us military efforts were trained. b. it houses the largest explosive weapons factory in the united states. c. it specializes in training soldiers to preserve the cultural artifacts of nations invaded by the us military. d. it is the oldest functioning installation in oklahoma.

This table shows the number of cities in north carolina from 1860 to 1910. which factor was responsible for the change in population from 1860 to 1910?