Conversation so far:
in which 2 hemispheres is north america located
The United States is in both the Northern and Western hemispheres.
what countries are in the southern hemisphere
The Southern Hemisphere includes most of South America, one-third of Africa, all of Antarctica, a small sliver of Asia and all of Australia/Oceania.

Question: what about in the west
Self-contained rewrite: what countries are in the western hemisphere