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.
Mexico
Agustín de Iturbide became constitutional emperor of the First Mexican Empire in 1822. A revolt against him in 1823 established the United Mexican States. In 1824, a Republican Constitution was drafted and Guadalupe Victoria became the first president of the newly born country. Central America, including Chiapas, left the union. In 1829 president Guerrero abolished slavery. The first decades of the post-independence period were marked by economic instability, which led to the Pastry War in 1836. There was constant strife between Liberals, supporters of a federal form of government, and Conservatives, who proposed a hierarchical form of government.