Western United States

American West redirects here. For the similarly-named airline see America West Airlines. The Western United States—commonly referred to as the American West or simply The West—traditionally refers to the region comprising the westernmost  states of the United States (see geographical terminology section for further discussion of these terms). Since the United States has expanded westward since its founding, the definition of the West has evolved over time. The Mississippi River is often referenced as the easternmost possible boundary of the West.
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Noun
1. the region of the United States lying to the west of the Mississippi River
(synonym) West
(hypernym) geographical area, geographic area, geographical region, geographic region
(hyponym) Wild West
(part-holonym) United States, United States of America, America, US, U.S., USA, U.S.A.
(part-meronym) Santa Fe Trail
(attribute) western
(class) ghost town