Is OKX legal in the United States?

Could you please clarify the legal status of OKX in the United States? Are there any restrictions or regulations that prevent American citizens from using OKX as a cryptocurrency exchange platform? Are there any specific states or jurisdictions within the US where OKX's services are prohibited or limited? I'm particularly interested in knowing if OKX complies with all relevant laws and regulations in the US to ensure that its users are protected and that their transactions are secure.