Hello,

No, Spain does not allow for US passport holders to have dual Spanish Nationality. When in Spain, they are only Spanish citizens.

If you are eventually able to get a work permit in Spain and you were born in Spain, you will be eligible for the Spanish Nationality after only one year holding a resident status. If your mother already holds a Spanish passport, you are considered a Spanish citizen by origins and you are free to apply for your Spanish passport whenever you like.

You can check the information at the Ministry of Justice Website, Nationality Section.

Regards,