“The political geography of this nation was a product of various treaties and acquisitions that eventually resulted in the country extending from the Atlantic to the Pacific Ocean.”
So the answer must be:
C.) The United States gained the area between the Atlantic Ocean and Appalachian Mountains from the original thirteen colonies in 1770.
The US reported 58 220 American casualties in the Vietnam war, although it may be higher. The causalities of North Vietnamese and Vietcong troops definitely exceed more than American casualties.