ANSWER ASAP
where were most of North America's networks of exchange located? Why?

North America's many networks of exchange were mainly centered along river valleys, such as the Mississippi River basin. Many agricultural communities lived around there, and the largest, called Cahokia, had a population of about 30,000 people! As a river basin, the area provided rich soil for farming.

which time period is this? or is this story fictional, i'm going to need more info to answer this question

answer; ///(1) blank; henry clay; (2) blank; secretary of state; (c)is your answer; ///good luck