How many other developed countries in the world allow tourists to unconditionally birth citizens?

allow to birth? Only God does that. US does entice tourists by granting citizenship to anybody born on US territory. If you don't like it - change the Constitution. If you aren't changing it, then you want it for some reason.

Edit: to the commenter below - what "moral" has to do with the Constitution provision? I mean beside the general understanding that Constitution is a law and following law is in general a moral thing, and that US Constitution was generally an attempt to write a good moral thing.

	▲	zahlman an hour ago \| parent [-]
		I first have to ask: do you personally think it makes sense that couples can enter the US illegally, remain in the US illegally until a child is born, and have that child automatically become a citizen? Do you think it is moral? Why? But just to clarify, GP was asking you whether that particular path to citizenship exists in other developed countries.