The Mexican Frontier, 1821–1846 published by other historians. This work was supplemented by additional primary materials which he discovered in the archives that allowed him to delve further into certain areas. "The Mexican Frontier" examines the southwestern United States, specifically the areas now known as Arizona, California, New Mexico, and Texas, in the twenty-five years between Mexico's independence from Spain and the beginning of the Mexican–American War. This resulted in the transfer of control of the border areas to the United States. In the early days of the Republic of Mexico, these areas comprised its northern border, including the territories of Alta California and
Bolivian War of Independence Bolivian War of Independence The Bolivian war of independence began in 1809 with the establishment of government juntas in Sucre and La Paz, after the Chuquisaca Revolution and La Paz revolution. These Juntas were defeated shortly after, and the cities fell again under Spanish control. The May Revolution of 1810 ousted the viceroy in Buenos Aires, which established its own junta. Buenos Aires sent three military campaigns to the Charcas, headed by Juan José Castelli, Manuel Belgrano and José Rondeau, but the royalists ultimately prevailed over each one. However, the conflict grew into a guerrilla war, the War of the