Fun fact: in order to get citizenship in Germany by way of naturalization, you must first renounce your current citizenship before you can proceed to become a German citizen. The process makes the applicant stateless.

In the United States, you can renounce your citizenship without having another nationality, therefore becoming stateless. You will just not have the rights that come with being a citizen. But there are caveats and they will deny your request if you express that you want to keep some of your citizenship rights.

Source https://www.germany-visa.org/german-citizenship/by-naturalization/ https://md.usembassy.gov/u-s-citizen-services/renounce-citizenship/