Good luck on the Birthright (you'll need a Constitutional amendment).
And enjoy crime going up (because people won't talk to the police). It will be terrific for the black market.(you'll need a Constitutional amendment).
No, you'll need a SCOTUS ruling on a Constitutional Amendment.
SCOTUS has already ruled on birthright citizenship, repeatedly.
as has Roe v Wade.
and it still comes up
A challenge to the core issues of Roe has never been accepted by SCOTUS.
Jus Soli is pretty explicit in the Constitution.