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bills

A U.S. legislative measure is a bill until enacted; it then becomes an act or a law.

Descriptive references to pending legislation should be lowercase (food-stamp bill, appropriation bill) except for words normally capitalized:
            Senate bill 217 (S. 217)
            House bill 31 (H.R. 31)
            Kiess bill
            Walsh-Healey bill
but     Reform Bill of 1832 (England)
            GI Bill
            GI Bill of Rights

See acts and laws (federal, state, foreign).