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Yes, each state regulates their own insurance industry.
How various insurance companies are able to sell insurance in various states is that they must have a licensed agent in each state they want to sell insurance in.
Usually it's just a matter of filling out the regristration and paying the licensing fee for each and every state.
Many agents are licensed in multiple states at the same time - which is very expensive.
If your selling insurance within a state - you would have to contact that state to see what the requirements would be for selling that type of insurance or risk policy.