The Spanish-American Frontier, 1783-1795: The Westward Movement And The Spanish Retreat In The Mississippi Valley is a historical book written by Arthur Preston Whitaker. The book explores the period of time between 1783 and 1795, during which the United States was expanding westward and the Spanish were retreating from the Mississippi Valley. The book covers the political, economic, and social factors that led to this shift in power, including the...