I'm from Australia, and meeting women at these venues in America is much easier than in my home country - large Australians cities have such a huge influx of young Indian male migrants, that the gender ratios at many of these venues are inequitable.
Wow I don't think I've ever seen this in my life. Most meetups I've seen look something like "meetup for professional women in their 40s", "MLM recruiting event meetup" "Wannabe thought leaders talk vaguely about business meetup", "seniors biking meetup (60+)", etc. Anything I've seen on meetup, either seems to target some hyper specific demographic, or be a some sort of scam, or old people doing hobbies. Singles groups tend to trend 30s and 40s or even enforce that.
Also bars are pretty good for meeting people IMO, but only in the sense of "some rando my father's age said something to me and now ere rambling nonsense to each other thanks to the alcohol. I've been to venues with younger people, but those always seemed so cliqued up and no one talks to you.
Maybe the southern US trends older in general though.
There are a ton in Dallas, Texas. In fact, I don't know how I would meet people here otherwise, given how otherwise insular the culture is.
But you went to America.
Which is ironic on multiple levels but atleast you met your wife :)
(btw, didn't you see Indians in America?)