Generally, if you are not a US citizen you are considered a nonresident alien by the IRS unless you meet one of the following criteria:

Green card test: You are a lawful permanent resident as determined by Immigration, that is, you have been issued a resident alien registration card (“Green Card”) by US Immigration Services, or…

In general, you are a U.S. citizen and U.S. taxpayer if you were born in the United States. Unlike many jurisdictions, the U.S. taxes its citizens regardless of where they live (or even if they have never lived in the United States). We cannot accept IRS Form W-8 from a U.S. citizen, and must receive a Form W-9 instead. If you are a former U.S. citizen who gave up your citizenship, please refer to …

In most cases, you automatically acquired U.S. citizenship when you were born in the United States even if you have never applied for a passport. U.S. tax rules designate all U.S. citizens as U.S. taxpayers, even those that did not live in the U.S. or receive a U.S. passport. U.S. citizens are required to provide us with IRS Form W-9 and a valid taxpayer ID (e.g. Social Security Number). Nevertheless, we may accept IRS Form W-8 from you to establish your status as a non-U.S. taxpayer if you provide us with a copy of your Certificate of Loss of Nationality of the United States (Form DS-4083) and a copy of your unexpired passport evidencing citizenship in another country…

FATCA related FAQs involving U.S. Place of Birth. See here for other FATCA related FAQ topics…