A bill is a proposal for

A bill is a proposed new law introduced within a legislature that has not been adopted. Once a bill has become law, it is thereafter an act; but in popular usage the two terms are often treated as if they meant the same.

Explanation:

the compromise of 1850 was a package of five separate bills passed by the united states congress in september 1850, which defused a four-year political confrontation between slave and free states on the status of territories acquired during the mexican–american war

in griswold v. connecticut (1965), the supreme court ruled that a state's ban on the use of contraceptives violated the right to marital privacy.