Tax questions regarding US and European countries

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Newbie here. I have my store pretty much all set up and ready to go, I live in Canada and the Canadian tax has set up. But now I don't know how to set up the US taxes as well as for European countries.

Do I have to register every state in the US for me to be able to tax the US customers,

also the same question for the European countries. 



Thank you for your help