In the real world birthright citizenship exists. It is accepted in the voting booth and passport issuance to name a few. We can argue about the 14th amendment, but existing law and regulations recognize birthright citizenship. Really.
Then there's this:
In United States v. Wong Kim Ark (1898):
The Supreme Court held that under the Fourteenth Amendment, a man born within the United States to Chinese citizens who have a permanent domicile and residence in the United States and are carrying out business in the United States—and whose parents were not employed in a diplomatic or other official capacity by a foreign power—was a citizen of the United States.
Subsequent decisions have applied the principle to the children of foreign nationals of non-Chinese descent.
Do wetback parents of anchor babies fit that set of conditions.
What other developed nation is stupid enough to do this....Canada?