Cause: “About 1.7 million live in just four California counties alone, Los Angeles, Orange, San Diego and Riverside.”
Which is why the D’s fight so hard for them - they give areas with large illegal population an over-representation of the area’s citizens in the House. The numbers voting in some of the districts is simply amazing when compared to areas without large numbers of illegals - we have much less clout.
Without question DMV Motor Voter law in California enabled the staunch Republican areas to be denied their proper representation along with open primaries and top two vote getters. Absolute democracy.