During the Vietnam War, US troops had the advantage of college deferments.
access to Chinese military resources.
superior geographic knowledge of the region.
superior firepower.

Answer

D. superior firepower

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers