This question presents a sentence, part of which or all of which is underlined. Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise, choose one of the others.
The numbers of colony outside the Southeast grew by nearly a 15 percent increase in the years following the revolution and accounted for the formation of approximately 20 new tribes.