Locate within Ian Haney Lopez’s chapters why it was necessary to “prove Mexicans exist” and to “invent Chicanos”? What is meant by these two phrases, “proving Mexicans exist” and “inventing Chicanos” and how do they relate to El Plan de Santa Barbara. Locate a clip from ¡Chicano! Taking Back the Schools (no longer than one minute) that supports your answer to the above questions.