Answer:
In "Barrio Boy," the book by Ernesto Galarza, Lincoln Elementary School helped immigrant children become "Good Americans" by providing them with an education that emphasized English language proficiency, American customs, and cultural assimilation. The school aimed to help these children integrate into American society by teaching them the language, values, and behaviors expected of mainstream American citizens. This approach was part of the broader assimilationist philosophy prevalent during that time period, which sought to help immigrants adapt to their new country's culture and way of life.