Mendez, et al v. Westminister [sic] School District of Orange County, et al, 64 F.Supp. 544, aff'd, 161 F.2d 774, was a 1947 federal court case that challenged Mexican remedial schools in four districts in Orange County, California. In its ruling, the United States Court of Appeals for the Ninth Circuit, in an en banc decision, held that the forced segregation of Mexican American students into separate "Mexican schools" was unconstitutional because as US District Court Judge Paul J. McCormick stated, "The evidence clearly shows that Spanish-speaking children are retarded in learning English by lack of exposure to its use because of segregation, and that commingling of the entire student body instills and develops a common cultural attitude among the school children which is imperative for the perpetuation of American institutions and ideals."

Orange County is a county located in the Los Angeles metropolitan area in Southern California, United States. As of the 2020 census, the population was 3,186,989, making it the third-most-populous county in California, the sixth-most-populous in the United States, and more populous than 19 American states and Washington, D.C. Although largely suburban, it is the second-most-densely-populated county in the state behind San Francisco County. The county's three most-populous cities are Anaheim, Santa Ana, and Irvine, each of which has a population exceeding 300,000. Santa Ana is also the county seat. Six cities in Orange County are on the Pacific coast: Seal Beach, Huntington Beach, Newport Beach, Laguna Beach, Dana Point, and San Clemente.