答案是：real id 不一定能用来证明公民身份，迄今只有五个州的增强版驾照是可以 用来证明公民身份的，但还要额外收费

https://www.wral.com/story/fact-check-can-you-use-real-id-to-register-to-vote-under-gop-bill/21992858/

However, not every Real ID meets SAVE Act requirements to prove citizenship. The SAVE Act accepts only Real IDs that indicate whether a person is a citizen, which most do not.

Further, Real IDs can be issued to noncitizens with lawful status, including permanent residence, temporary protected status, refugees, asylum applicants and people in the Deferred Action for Childhood Arrivals program, the Homeland Security Department’s website says.

Five states — Michigan, Minnesota, New York, Vermont and Washington — offer a version of Real ID that indicates whether a person is a U.S. citizen, called an enhanced driver’s license. These licenses are offered at an additional fee, so not every Real ID in those states is compliant with the SAVE Act. Homeland Security officials have been working since 2008 to bring the enhanced ID program to all states.

One more state, Idaho, in 2023 began offering IDs with an optional citizenship marker, although it’s unclear whether all are Real ID compliant.