Initiatives and referendums in the United States

In the politics of the United States, the process of initiatives and referendums allow citizens of many U.S. states to place legislation on the ballot for a referendum or popular vote, either enacting new legislation, or voting down existing legislation. Citizens, or an organization, might start a popular initiative to gather a predetermined number of signatures to qualify the measure for the ballot.

Source: Wikipedia — Initiatives and referendums in the United States (CC BY-SA 4.0)