The United States began along the shores of the Atlantic Ocean. The first state admitted to the country located west of the Mississippi was Louisiana.
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Mississippi was admitted into the Union on December 10, 1817 becoming the 20th state to join the Union.
I believe it was by the president at the time it was admitted into the union.
California was the first state on the Pacific coast to be admitted into the union. California was admitted into the Union on September 9, 1850 becoming the 31st state to join the Union. Oregon was admitted into the Union on February 14, 1859 becoming the 33rd state to join the union. Washington was admitted into the Union on November 11, 1889 becoming the 42nd state to join the Union.
The first frontier state to enter the Union was Vermont in 1791.
On December 10, 1817, Mississippi was the 20th state admitted to the Union. On January 9, 1861, Mississippi became the second state to declare its secession from the Union, and it was one of the founding members of the Confederate States of America.