In some systems, the head of state or other official must give his final consent, as for example during royal approval in Commonwealth empires. In others, a bill automatically becomes law, unless a veto is vetoed, as in the United States, for example. But these measures alone do not yet make an act legally binding on the population. A legislative act is usually brought into force in one of three ways: in law, entry into force or entry into force (also called beginning) is the process by which laws, regulations, treaties and other legal instruments have the force of law and effect. The term is closely related to the date of this transition. .