The Mexican Border War, or the Border Campaign, refers to the military engagements which took place in the Mexican–American border region of North America during the Mexican Revolution. The war's time period encompassed World War I, during which Germany attempted to have Mexico attack the United States and engaged in hostilities against American forces there itself. The Border War was the fifth and latest major conflict fought on American soil, whereas its predecessors were the American Revolutionary War, War of 1812, Mexican–American War (1846–1848) and the American Civil War. The end of the Mexican Revolution on 1 December 1920, marked the close of the American Frontier. The Bandit War in Texas was part of the Border War. From the beginning of the Mexican Revolution in 1910, the United S