e/Trans-Mississippi

Information
has gloss	eng: The Trans-Mississippi was the geographic area west of the Mississippi River during the 19th century, containing the states of Arkansas, Louisiana, Missouri and Texas, and the Indian Territory (now Oklahoma). The term was especially used by the Confederate States of America as the designation for the theater of operations west of the Mississippi. The geographical term is generally used today only in matters relating to the study of the American Civil War.
lexicalization	eng: Trans-Mississippi
instance of	c/Former regions and territories of the United States