The Northeast became a leader in commerce because of its location and early development of industrial industries. The Northeast became a manufacturing hub in the colonies and in the newly formed United States which created specialization and the growth of commerce in this region relative to the South which was more agriculturally based.
An increase in human population leads to environmental issues such as pollution. This is because when there is an increase in population there would be an increase food resources therefore would have more pollution as well as higher gas emissions.
It depends on the map. There should be a key indicated.
