Regarding CPSLO’s relative lack of ethnic diversity, note the demographics of San Luis Obispo County in comparison to the state: https://www.census.gov/quickfacts/fact/table/CA,sanluisobispocountycalifornia/PST045219 . While CPSLO may be a “destination” campus that attracts students from other parts of the state for engineering, it may be much less so for most other majors.
Hispanic or Latino students are overrepresented compared to the state population at some campuses like UCR, UCM, CSULA, CSULB, CSUDH, and CSUSB. Black students are overrepresented compared to the state population at some campuses like CSUEB and CSUDH. However, both groups are underrepresented at many more campuses than they are overrepresented.