The two true statements about the fall line are:
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Many cities have developed along it. - The fall line has historically been significant for trade and transportation, leading to the development of numerous cities.
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It makes the northern edge of the Piedmont region. - The fall line is indeed the boundary that represents the transition between the Piedmont region and the coastal plain.
The other statements are not accurate regarding the fall line. The rivers generally flow more quickly as they descend from the higher Piedmont region down to the lower coastal plain, and it does not contain large numbers of swamps compared to other areas.