section_path: History/Constitutional monarchy (1849–present)
section_name: Constitutional monarchy (1849–present)
paragraph_text: Constitutional monarchy (1849–present)
  
  A nascent Danish liberal and national movement gained momentum in the 1830s; after the European Revolutions of 1848, Denmark peacefully became a constitutional monarchy on 5 June 1849. A new constitution established a two-chamber parliament. Denmark faced war against both Prussia and the Austrian Empire in what became known as the Second Schleswig War, lasting from February to October 1864. Denmark was defeated and obliged to cede Schleswig and Holstein to Prussia. This loss came as the latest in the long series of defeats and territorial losses that had begun in the 17th century. After these events, Denmark pursued a policy of neutrality in Europe.
  
  Industrialisation came to Denmark in the second half of the 19th century. The nation's first railways were constructed in the 1850s, and improved communications and overseas trade allowed industry to develop in spite of Denmark's lack of natural resources. Trade unions developed, starting in the 1870s. There was a considerable migration of people from the countryside to the cities, and Danish agriculture became centred on the export of dairy and meat products.
  
  Denmark maintained its neutral stance during World War I. After the defeat of Germany, the Versailles powers offered to return the region of Schleswig-Holstein to Denmark. Fearing German irredentism, Denmark refused to consider the return of the area without a plebiscite; the two Schleswig Plebiscites took place on 10 February and 14 March 1920, respectively. On 10 July 1920, Northern Schleswig was recovered by Denmark, thereby adding some 163,600 inhabitants and 3,984 square kilometres (1,538 sq mi). The country's first social democratic government took office in 1924.
  
  In 1939, Denmark signed a 10-year nonaggression pact with Nazi Germany. However, Germany invaded Denmark on 9 April 1940, and the Danish government quickly surrendered. However, as around 10% of the German army's foodstuff was supplied by Danish agricultural output and Germany wanted that supply line to continue, the occupation was more cooperative and less harsh than many other countries in Europe. World War II in Denmark was characterised by economic co-operation with Germany until 1943, when the Danish government refused further co-operation and its navy scuttled most of its ships and sent many of its officers to Sweden, which was neutral. At that point the government fell. The Danish resistance performed a rescue operation that managed to evacuate several thousand Jews and their families to safety in Sweden before the Germans could send them to death camps. Some Danes supported Nazism by joining the Danish Nazi Party or volunteering to fight with Germany as part of the Frikorps Danmark. Iceland severed ties with Denmark and became an independent republic in 1944; Germany surrendered in May 1945. In 1948, the Faroe Islands gained home rule. In 1949, Denmark became a founding member of NATO.
  
  Denmark was a founding member of the European Free Trade Association (EFTA). During the 1960s, the EFTA countries were often referred to as the Outer Seven, as opposed to the Inner Six of what was then the European Economic Community (EEC). In 1973, along with Britain and Ireland, Denmark joined the European Economic Community (now the European Union) after a public referendum. The Maastricht Treaty, which involved further European integration, was rejected by the Danish people in 1992; it was only accepted after a second referendum in 1993, which provided for four opt-outs from policies. The Danes rejected the euro as the national currency in a referendum in 2000. Greenland gained home rule in 1979 and was awarded self-determination in 2009. Neither the Faroe Islands nor Greenland are members of the European Union, the Faroese having declined membership of the EEC in 1973 and Greenland in 1986, in both cases because of fisheries policies.
  
  Constitutional change in 1953 led to a single-chamber parliament elected by proportional representation, female accession to the Danish throne, and Greenland becoming an integral part of Denmark. The centre-left Social Democrats led a string of coalition governments for most of the second half of the 20th century, introducing the Nordic welfare model. The Liberal Party and the Conservative People's Party have also led centre-right governments.