Answer:
The Union took a defensive stance in the West. The Union had more troops than the Confederacy in the West
Explanation:
=)
The correct answer is D. unfamiliar with the geography and terrain.
The Continental Army, lead by George Washington, squared off with the British army during the American Revolution. During this time, the colonists were extremely unorganized, had little supplies, and was staffed by thousands of volunteers.
However the Continental Army did have an advantage in knowing the geography/climate. Considering the volunteer soldiers for the Continental Army lived in the 13 colonies (where the fighting took place) the geography and terrain was very familiar to them.
The United states help Panama declare independence from Colombia then negotiated for the canal
Actually the real answer is the second and first world war pouring money into the us economy for output. If that is not an option it would be the invention of the steam engine and the 1800's locomotive industry.