The US government has outlined five circumstances that may result in loss of citizenship. Another is entering military service in a foreign country, although this also depends on specific legal requirements. Which Other Actions Can Trigger Citizenship Loss? The US also listed committing an act of treason against the country as one of the grounds that could result in the loss of citizenship. In addition, a naturalised US citizen may face denaturalisation if found guilty of certain qualifying crimes, which could also lead to the loss of citizenship.