Contra Costa County, California
In 1821 Mexico gained independence from Spain. While little changed in ranchero life, the Mexican War of Independence resulted in the secularization of the missions with the re-distribution of their lands, and a new system of land grants under the Mexican Federal Law of 1824. Mission lands extended throughout the Bay Area, including portions of Contra Costa County. Between 1836 and 1846, during the era when California was a province of independent Mexico, the following 15 land grants were made in Contra Costa County.
First Mexican Republic
The Spanish overseas possession of the Viceroyalty of New Spain lasted for 300 years, from 1521 with the fall of the Aztec capital of Tenochtitlan and the foundation of Mexico City until the collapse of the viceroyalty in following years of civil war and military stalemate. An insurgency for independence from Spain lasted from the initial 1810 mass revolt, led by secular cleric Miguel Hidalgo and continued under another secular cleric, José María Morelos, and carried on the hot country of Mexico's south by Vicente Guerrero. Augustin Iturbide, a royalist military officer born in New Spain of Spanish parents, made a strategic alliance with Guerrero under the Plan of Iguala, in which the former foes fought in tandem to oust Spanish rule. The plan proclaimed Mexico a nation-state; Roman Catholicism as the sole religion; the equality of Spaniards and American-born Spaniards and abolished legal racial designations, and was to be a constitutional monarchy. On September 27, 1821, Mexico obtained its sovereignty under the Treaty of Córdoba, which recognized New Spain as an independent empire, which took the name the Mexican Empire.