There are 12 monarchies in the Americas, being either sovereign states or self-governing territories that have a monarch as head of state. Each is a constitutional monarchy, wherein the monarch inherits his or her office according to law, usually keeping it until death or abdication, and is bound by laws and customs in the exercise of their powers. Ten of these monarchies are part of the global personal union known as the Commonwealth realms and share Charles III, who resides in the United Kingdom, as king. The other two are the Monarchy of the Netherlands which is used in states of the Dutch Caribbean, and the Monarchy of Denmark which is used in Greenland. As such, none of the monarchies in the Americas have a permanently residing monarch, though the Commonwealth realms each have a resident governor-general to represent King Charles III and perform most of his constitutional duties in his name; and a high commissioner represents the King of Denmark and the Danish government in Greenland. Additionally, each of Canada's 10 provinces functions as a subnational constituent monarchy, with the constitutional powers vested in the King exercised at the provincial level by a lieutenant governor.
Historically, some pre-Columbian societies existed under monarchical forms of government, while others had a decentralised collection of tribal regions under a hereditary chieftain. None of the contemporary monarchies, however, are descended from those pre-colonial royal systems, instead either having their historical roots in European monarchies which colonized the New World beginning in the 15th century.
