The rhetorical mode of definition would be bold yet effective to use. If the writer had stated something like: Chicano Culture- It is the way we live. It is our "behaviors, beliefs, values, and symbols" (https://www.tamu.edu/faculty/choudhury/culture.html). It is not something that needs to be accepted by those who oppose it. It is permanent and forever changing among all groups of people. This would give the reader a quick conclusion of the three excerpts.
Another rhetorical mode that would have been effective is process analysis. If the writer listed steps on how the Chicano and Anglo languages slowly started to merge throughout history, the reader could see clearly how as time and culture changed language did too.
Peaches Andrews