Is Wholesaling Legal in Every State?

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Where does an individual find out if it's legal to wholesale?  I heard from a couple sources NY state requires a Real Estate Licence but I'm not fully confident in this source.  I've tried looking online but I get a lot of different answers.  Any input would help.  I have just learned of the concept and I think wholesaling will really help to get me started but I don't want to get myself into any trouble.  Thank you in advance.