2 i believe I am not 100% sure
It helped the US economy grow, because it gave the US more of a reason to industrialize like the British. The US needed to mass produce guns and ammunition in order to recreate their military. The mass production of products led to the Industrial Revolution years later.
B.
the US Interstate Highway System
Answer: becasue the Colonists who had already settled on these lands were ordered to return east of the mountains.
Explanation: