How did the Columbian Exchange and the slave trade affect the economies and the people of Europe, Africa, and the Americas?

Exploration brought Native American diseases and, as a consequence, created a need for African slaves that were immune to European diseases.

Explanation:

all cities have a governor

all cities are in states or provnies then country

all cities have people

difference

some are rich

some are poor

some are average

answer; i believe the correct answer is prefrontal cortex;