Which of the following best explains why trade among the colonies flourished? a
The different regions specialized in different crops.

b
The colonies had developed large fleets of trading ships.

c
Existing trade routes were well-maintained by Native Americans.

d
Colonies were founded with specific trade agreements in place.

d. Colonies were founded with specific trade agreements in place.

Explanation:

The best explanation as to why trade among the colonies flourished is that "Colonies were founded with specific trade agreements in place."

This is evident in the fact that the colonies in the southern part of the thirteen colonies (later the United States) focused on agriculture, while those in the northern part focused on lumbering, shipping, and port.

This thereby led to efficiency in production and services.

a. "how old man winter was driven back” and “ormuzd and arimanes"

a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.