The United Kingdom is one of the few democratic countries in the world that does not have a single, written constitution. Others include Canada, New Zealand and Israel. To date, its constitution is a combination of written and unwritten sources, including statutes, common law, conventions and somewhat esoterically, royal prerogatives. The reason for this is predominantly historical. Since 1688, Britain has not experienced a revolution or regime change, which often leads to a constitutional initiative, such as the American or the French Revolution. Britain’s constitution has evolved slowly over time under relative stability and as such, it has never been deemed necessary to list the fundamental laws and principles of the country's political system.