MexAmerica is a southern region in the United States that is along the border of the US and Mexico. This region has a lot of Spanish/Mexican/Hispanic influence because of it's proximity to the border. This region has a high population of Mexicans compared with the rest of the country and a lot of cities has Spanish names that have stuck around even after they became US territories. Since the Valley is a part of California which used to be Mexican/Spanish territory, there is a lot of Mexican influence in the Valley. According to the US Census Bureau, the Valley has about 42% Hispanic/Latino population*. Not only is the influence in the demographics, but also in the architecture of homes and older buildings. There are thousands of "Spanish Style" homes throughout the valley and it is one of the most popular classic styles for building a house most recognizable by multiple arches along the front of a house and it is influenced by the Hispanic culture.
*http://factfinder2.census.gov/faces/tableservices/jsf/pages/productview.xhtml?pid=ACS_12_5YR_DP05&prodType=table
