Earlier quoted context omitted.
You've had a secured card for over a year and still receive "insufficient credit history" denials, even for basic unsecured cards? Have you ever defaulted on a debt or something similarly bad? If you haven't, have you checked your credit reports (from all 3) to make sure there isn't false/fraudulent info on there?
That's how my journey started. I wanted to take advantage of my frequent flights (pre-pandemic), and applied for a card with travel benefits, only to be declined. I decided to check my credit report, and noticed a default from like 5 years ago that had been sent to collections -- it was a paltry sum. Some years ago, I was in the US for a couple months for work, and got a monthly phone contract with a large mobile pro…
Hmm, you may want to check if there are other public records with respect to this. That seems much more likely than redlining. (Also, credit card companies have been criticised both ways on this—for denying credit to such neighbourhoods as well as for flooding them with offers.)