Why is New York so liberal now?

It was very conservative back from like 2009-2016 and I know its pride month but when I first moved from South Carolina 13 years ago I felt not much social difference between the deep south and NY and now cannabis is legal, it has become pro abortion, and very lgbt oriented. There is nothing wrong with it but its a big change and will probably happen to the deep south too.
Why is New York so liberal now?
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