Is Delta 9 legal in all 50 states?

Hello there, I'm curious about the legality of Delta 9 in the United States. Specifically, I'm wondering if it's legal to possess and use Delta 9 in all 50 states. I understand that cannabis laws can vary greatly from state to state, and I'm hoping you can provide some clarity on this matter. Could you please elaborate on the current legal status of Delta 9 in the US, and if there are any exceptions or special considerations that I should be aware of? Thank you in advance for your assistance.