Can citizenship be affected for defaulting on credit cards?

Defaulting on any debt will affect your credit score in a negative manner. If you are having financial difficulty with your debts you have a few options. Contact a reputable credit repair company (if you need credit restoration), or contact your local credit counseling organization (they can assist you wil paying your debts by stopping the interest, and making a very low monthly payment until you become debt free. Your third option is consulting with a bankruptcy attorney if this is the only choice that you have.