Unfortunately, this article is 3 years old and the data is inaccurate. Immigration from PR to USA has been huge in last three years; thus, you should update your data!
Yeah, But if you look even closer and do the math. They updated that article in 2020. Its four years out of date. Hence the reason why the url has 21 in it and the current version of the article has 20 states but the current number is 18 states.
A better way to say is Puerto Rico has more US citizens than 18 US States. If the goal is to piss off maga that is.
This page from 2020 says 20
https://puertoricoreport.com/population-puerto-rico-exceeds-populations-21-states/
A comment on that linked story says:
Yeah, But if you look even closer and do the math. They updated that article in 2020. Its four years out of date. Hence the reason why the url has 21 in it and the current version of the article has 20 states but the current number is 18 states.