This dissertation explores the educational history of Mexican Americans in Arizona. It focuses on the post World War II activism of Tucson Mexican Americans who challenged educational policies, practices, and programs such as segregation, Americanization, and language restriction. These practices shaped Mexican American education for much of the twentieth century. Beginning in 1950, Mexican American men and women engaged in grassroots activism by participating in multiethnic, multifaceted coalitions to challenge educational inequalities and promote meaningful educational reform between 1950 and 1990. Their efforts led to the passage of local, state, and national educational reforms, including the repeal of school segregation state laws, the implementation of Spanish-for-Spanish-speakers and bilingual-bicultural education programs, and the enactment of the federal Bilingual Education Act of 1968. In 1974, Mexican American parents filed a joint lawsuit with Black parents against Tucson School District No. 1, the largest district in the state, charging the district with de jure segregation of Mexican American and Black students. I assert that Mexican Americans promoted institutional reforms from the bottom up that would not only provide Mexican-origin children with equal educational opportunity, but would also meet the community's needs based on their own definition of equity. In doing so, Mexican Americans not only contested their subordinate status in the dominant society by directly challenging the traditional stronghold that Anglo Americans had on the public education system, but they also helped to advance the quest for educational equality and civil rights.