Yes you can file a lawsuit against anyone no matter the nationality because you have right to access to justice. However, there are principles that govern and stipulate the appropriate place to file a particular lawsuit. It therefore means that you can't just file a lawsuit in America because you are aggrieved by the conduct of an American. We can only advise you on the appropriate jurisdiction or place to file your lawsuit after full briefing. To proceed further, click the consult button on my profile.