After being born in the United States, can I apply for American citizenship again with my birth certificate?

If you have given up your American citizenship, it is impossible to apply for American citizenship again with your birth certificate. A birth certificate can only prove that a person was born in the United States, but it cannot automatically grant American citizenship.

If you want to regain American citizenship, you need to apply according to the procedures stipulated by American law, such as complying with American law, meeting residence requirements, and meeting naturalization tests. If you have previously renounced U.S. citizenship, you may need to submit a reinstatement application to the U.S. Immigration Service (USCIS). However, this kind of application usually needs to meet certain conditions, such as residence time in the United States, tax records and so on.

It is recommended to consult the US Immigration Bureau or law firm for specific application procedures and requirements.