When someone asks you a question like, What are the most northern, southern, eastern, and western states of America? you have to assume it’s a trick question:
If you note the map above, Alaska is clearly the most northern state, and Hawaii, at 20º North, is without doubt the most southern state. (Note how much further south it is than Florida}As far as the most western state, note how Alaska’s Aleutian Islands stretch right up to the edge of the Western Hemisphere at the 180º line of Longitude, thus the most western state in the country.
Alaska is also the answer for eastern, as the Aleutian Islands stretch across the 180º line of Longitude, into the Eastern Hemisphere, and up the edge of the Russian Federation.