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
History of Hispanic and Latino Americans in the United States from Nacogdoches traded with the French and Anglo residents of Louisiana, and were culturally influenced by them. The third settlement was located North of the Rio Grande toward the Nueces River. These Southern ranchers were citizens of Spanish origin from Tamaulipas and Northern Mexico, and identified with both Spanish and Mexican culture. 1821, Agustin de Iturbide launched a drive for Mexican Independence. Texas became a part of the newly independent nation without a shot being fired. In 1821 at the end of the Mexican War of Independence, there were about 4,000 Tejanos living in what is now the state of