Back in 2002, the Los Angeles Times reported on "birth tourism" by Koreans: citizens of Korea temporarily visiting the U.S. in order to give birth and abusing our laws which have been interpreted to grant birthright citizenship.

Now, they have a report on unlicensed "birthing centers" for Chinese nationals that were recently shut down in San Gabriel (east of Pasadena). Per them ("'Birthing tourism' center in San Gabriel shut down" by Ching-Ching Ni, link):

Southern California has become a hub of so-called birthing tourism. Operators of such centers tend to try to blend in, attracting as little attention as possible.

But on quiet, residential Palm Avenue, neighbors had noticed an unusual number of pregnant women going in and out, and some complained about noise.

On March 8, code enforcement officials shut down three identical four-bedroom townhouses functioning as an unlicensed birthing center.

...Most of the women go back to China after giving birth. But they know their children can return easily in the future to enjoy such benefits as free public education.

That bothers some of those living near the San Gabriel center.

"If they lived here, I don't mind," said Duke Trinh, who lives a few houses down. "If they are running a business, I don't want them here. It's not fair for us if [the mothers] go back to China and later send their kids here for education — because they don't pay taxes, we do."