What should I be aware of when visiting the US?

Hi, I'm planning to visit the US in a few months. I am from England, and I was wondering if there is any do's/dont's that I should be aware of while on holiday. Also, what cities and states are the least dangerous/ most progressive? Thank you.
What should I be aware of when visiting the US?
What should I be aware of when visiting the US?
Updates:
3 mo
Im mainly visiting the East Coast
What should I be aware of when visiting the US?
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