What is the western hemisphere

" The Western Hemisphere is a geographical term for the half of Earth which lies west of the prime meridian and east of the antimeridian. The other half is called the Eastern Hemisphere "

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

#2 the answer is d

#3 the answer is a

#4 the answer is b