Yup, and when you don’t have any citizenship, you’re stateless. It causes a lot of issues internationally, because a stateless person can’t have a passport, can’t immigrate, can’t hold a legal job because they can’t get a work visa without a passport, etc… Notably, the US is one of the few countries that refused to sign on with the Convention on the Reduction of Statelessness. Basically, the convention would prevent a country from revoking someone’s citizenship if they don’t have a valid claim elsewhere. And the US refused to sign.