48 CFR §3.1001

As used in this subpart— Subcontract means any contract entered into by a subcontractor to furnish supplies or services for performance of a prime contract or a subcontract. Subcontractor means any supplier, distributor, vendor, or firm that furnished supplies or services to or for a prime contractor or another subcontractor. United States means the 50 States, the District of Columbia, and outlying areas.