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.

the answer to your question is:

strong-mayor system

thurgood marshall

explanation: in 1954, thurgood marshall and a team of naacp attorneys won brown v. board of education of topeka, kansas. in this landmark decision, the supreme court held that segregation in public education violated the equal protection clause of the fourteenth amendment.