Denmark becomes a constitutional monarchy by the signing of a new constitution.

Denmark is a Nordic country in Northern Europe. It is the metropole and most populous constituent of the Kingdom of Denmark, also known as the Danish Realm, a constitutionally unitary state that includes the autonomous territories of the Faroe Islands and Greenland in the north Atlantic Ocean. Metropolitan Denmark, also called "continental Denmark" or "Denmark proper", consists of the northern Jutland peninsula and an archipelago of 406 islands. It is the southernmost of the Scandinavian countries, lying southwest of Sweden, south of Norway, and north of Germany, with which it shares a short border. Denmark proper is situated between the North Sea to the west and the Baltic Sea to the east.

Constitutional monarchy, also known as limited monarchy, parliamentary monarchy or democratic monarchy, is a form of monarchy in which the monarch exercises their authority in accordance with a constitution and is not alone in making decisions. Constitutional monarchies differ from absolute monarchies in that they are bound to exercise powers and authorities within limits prescribed by an established legal framework. A constitutional monarch in a parliamentary democracy is a hereditary symbolic head of state who mainly performs representative and civic roles but does not exercise executive or policy-making power.

The Constitutional Act of the Realm of Denmark, also known as the Constitutional Act of the Kingdom of Denmark, or simply the Constitution, is the constitution of the Kingdom of Denmark, applying equally in the Realm of Denmark: Denmark proper, Greenland and the Faroe Islands. The first democratic constitution was adopted in 1849, replacing the 1665 absolutist constitution. The current constitution is from 1953. The Constitutional Act has been changed a few times. The wording is general enough to still apply today.