In the politics of the United States, the process of initiatives and referendums allow citizens of many U.S. states to place new legislation, or to place legislation that has recently been passed by a legislature on a ballot for a popular vote. Initiatives and referendums, along with recall elections and popular primary elections, are signature reforms of the Progressive Era; they are written into several state constitutions, particularly in the West. It is a form of direct democracy. The technical name of these types of votes used internationally is referendum, but within the United States they are commonly known as ballot measures, propositions or ballot questions. Referendum within the United States normally refer specifically to questions about striking down enacted law, known internationally as the popular referendum. History The Progressive Era was a period marked by reforms aimed at breaking the concentrated power, or monopoly, of certain corporations and trusts. Many Progressives believed that state legislatures were part of this problem and that they were essentially "in the pocket" of certain wealthy interests. They sought a method to counter this—a way in which average persons could become directly involved in the political process. One of the methods they came up with was the initiative and referendum. Through 2006, 2,231 statewide initiatives were held in the United States, of which 887 were successful. Because US states with direct democracy require each signature to be witnessed and notarized by a circulator, gathering the required signatures usually costs millions of dollars in the larger states, to hire circulators. This means that the process, as with state legislatures described above, is also "in the pocket" of certain wealthy interests. In Boulder Colorado in 2021 the first official online petition system was used to get an initiative on the ballot, with no circulators involved: www.petitions.bouldercolorado.gov The voters of the city of Boulder approved a charter amendment allowing online petitioning by a vote of 71 to 29% in 2018. The proposal was developed by members of the city's Campaign Finance and Elections Working Group, spearheaded by Evan Ravitz and Steve Pomerance. Types of initiatives and referendums Initiatives and referendums—collectively known as "ballot measures," "propositions," or simply "questions"—differ from most legislation passed by representative democracies; ordinarily, an elected legislative body develops and passes laws. Initiatives and referendums, by contrast, allow citizens to vote directly on legislation. In many U.S. states, ballot measures may originate by several different