Are US citizens allowed to trade forex?

Could you please clarify the current regulations regarding whether US citizens are permitted to engage in foreign exchange trading? I understand that there are specific laws and restrictions in place, but I'm unsure of the exact guidelines. Is it possible for US residents to participate in the forex market, and if so, are there any specific rules or limitations they need to be aware of? Additionally, are there any reputable and reliable platforms or brokers that cater specifically to US traders?