What is "United States of America"?
How is it a party to lawsuits?
TITLE 18 > PART I > CHAPTER 47 > § 1001
NOTES:
Words “or any corporation in which the United States of America is a stockholder” in said section 80 were omitted as unnecessary in view of definition of “agency” in section 6 of this title.
http://www4.law.cornell.edu/uscode/html/uscode18/usc
TITLE 18 > PART I > CHAPTER 1 > § 6
§ 6. Department and agency defined
The term “agency” includes any department, independent establishment, commission, administration, authority, board or bureau of the United States or any corporation in which the United States has a proprietary interest, unless the context shows that such term was intended to be used in a more limited sense.
http://www4.law.cornell.edu/uscode/h...6----000-.html