Which would cause an American citizen to lose his or her citizenship?

An American citizen may lose their citizenship through a process known as expatriation, which can occur if they voluntarily choose to renounce their citizenship, typically by making a formal declaration before a U.S. consulate. Additionally, citizenship may be revoked if an individual is found to have obtained it through fraud or misrepresentation. Engaging in certain actions such as serving in a foreign military or taking an oath of allegiance to Another Country can also lead to loss of citizenship, although these cases are less common.