More than you ever wanted to know about jus soli in the United States (spin0r.wordpress.com)

Jus soli = birthright citizenship, for those confused by the title

Alas, this is also an example of the "bullshit asymmetry principle", where just one sentence of evil nonsense from the insincere (i.e.: "it doesn't count for children of illegal aliens") incurs a disproportionate amount of effort to carefully cage and debunk.