4. A birth certificate is just a piece of paper. I'm pretty sure that is not enough, on it's own, to prove citizenship.

5. The new administration is seeking to deny the validity of birthright citizenship. The implication of that would be that you are now required to have one or more parent's birth certificates in addition to your own, and probably several other documents.

5a. How many people carry their birth certificate around with them? 5b. What happens if the ICE agent conveniently loses your papers? Ooops.