These are irregular words in English:
Texas is the southernmost state in the U.S. (irregular)
or
Texas is the most southern state in the U.S. (regular)
Maine is the easternmost state in the U.S.
Alaska is the northernmost state in the U.S.
Hawaii is the westernmost state in the U.S.,
but California is the westernmost state in the continental U.S.
(the part of U.S. in North America).
