This is a rare and historically significant map of the Western United States in part relating to the 1849 California Gold Rush and Texas Statehood.  The Western United States covered by the map was of particular interest in 1849 because the height of the Gold Rush, shown in one of the insets, and 4 years prior in 1845, Texas became the 28th state, which prompted Mexico to invade Texas in 1846, precipitating the American-Mexican war.  High level of detail is provided, including topographical, settlement and transportation route elements.  The insets are: Maritime and Overland Routes to California; Gold & Quicksilver District of California.  The case contains description of gold region and information on types of gold and testing gold.