15 U.S.C. § 8101: Definition

In this Act, the term “United States person” means—(1) any United States resident or national, (2) any domestic concern (including any permanent domestic establishment of any foreign concern), and (3) any foreign subsidiary or affiliate (including any permanent foreign establishment) of any domestic concern that is controlled in fact by such domestic concern, except that such term does not include an individual who resides outside the United States and is employed by an individual or entity other than an individual or entity described in paragraph (1), (2), or (3).