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
Ecuadorian War of Independence Guaranda on September 2, 1821. Aymerich moved to block any further progress, and in the Second Battle of Huachi, which took place on September 12, 1821, annihilated Sucre's infantry. The patriot forces lost 800 men, mostly killed, plus 50 prisoners, among them General Mires. As Second Huachi had also taken a heavy toll on the Royalists, Aymerich decided against exploiting his victory with an advance on the coastal plains. On November 19, 1821, a 90-day armistice was signed at Babahoyo, putting an end to Sucre's ill-fated first attempt to liberate Quito. Ecuadorian War of Independence The Ecuadorian War of Independence