Right now Alaska is the most Western State in the Union since 1959.
But before Alaska, Washington State held the most western point title of the USA, from 1889 until 1959.
Before Washington State, Oregon was the most west of the west from 1859 until 1889.
Before Oregon, California was the most westward state from 1850 until 1859.
Before California, Texas was the most western state.
Before Texas, Missouri was the most western state from 1821 until 1845.
Before Missouri, Louisiana was the the most western from 1812 until 1821.
Before Louisiana, Tennessee was the most westward state from 1796 until 1812.
Before Tennessee, Kentucky was the most western state from 1792 until 1796.
Before Kentucky, Georgia was the most westward state from 1788 until 1792.
Before Georgia, Pennsylvania was the most western state for less than month between December 12, 1787 until January 2, 1788.
Before Pennsylvania, Delaware was the most western state.