Quick Google for the Census Bureau only turns up median rather than mean:
Median is probably a better value here since it’s going to reduce outlier effects.
Looks to me that median rent in most states in 1990 was closer to $300-400 per month than $500.
We also have real world examples like Alabama passing a voter ID law and then almost immediately turning around and closing DMV offices in poor, black counties, making getting an ID even more difficult for at-risk communities:
https://www.bloomberg.com/news/articles/2015-10-01/alabama-closes-dmv-offices-a-year-after-voter-id-law-kicks-in
Voter ID laws are very much about cloaking intentional disenfranchisement of legal citizens in a veil of preventing virtually non-existent voter fraud.