Birth Tourism Media Mention
Some things to note in the article.
Last data is from 2012, so a bit out of date.
The booming business of U.S. birth tourism - CBS News
What I have observed. Rowland Heights seems to a major destination for birth tourism. My guess is many stay in the apartments across from Target.
Enforcement by the IRS of the law that all citizens need to pay US taxes. The problem, is this can open up closely held family owned companies in China, to the IRS.