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After Sweden permanently broke away from the personal union, Denmark tried on several occasions to reassert control over its neighbour. King Christian IV attacked Sweden in the 1611–1613 Kalmar War but failed to accomplish his main objective of forcing it to return to the union. The war led to no territorial changes, but Sweden was forced to pay a war indemnity of 1 million silver riksdaler to Denmark, an amount known as the Älvsborg ransom.^[37] King Christian used this money to found several towns and fortresses, most notably Glückstadt (founded as a rival to Hamburg) and Christiania. Inspired by the Dutch East India Company, he founded a similar Danish company and planned to claim Ceylon as a colony, but the company only managed to acquire Tranquebar on India’s Coromandel Coast. Denmark’s large colonial aspirations included a few key trading posts in Africa and India. While Denmark’s trading posts in India were of little note, it played an important role in the highly lucrative Atlantic slave trade, through its trading outposts in Fort Christiansborg in Osu, Ghana through which 1.5 million slaves were traded.^[38] While the Danish colonial empire was sustained by trade with other major powers, and plantations – ultimately a lack of resources led to its stagnation.^[39]

In the Thirty Years’ War, Christian tried to become the leader of the Lutheran states in Germany but suffered a crushing defeat at the Battle of Lutter.^[40] The result was that the Catholic army under Albrecht von Wallenstein was able to invade, occupy, and pillage Jutland, forcing Denmark to withdraw from the war.^[41] Denmark managed to avoid territorial concessions, but King Gustavus Adolphus‘ intervention in Germany was seen as a sign that the military power of Sweden was on the rise while Denmark’s influence in the region was declining. Swedish armies invaded Jutland in 1643 and claimed Scania in 1644. In the 1645 Treaty of Brømsebro, Denmark surrendered Halland, Gotland, the last parts of Danish Estonia, and several provinces in Norway.

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The Assault on Copenhagen on 11 February 1659 during the Second Northern War. Danish defenders under King Frederick III successfully repelled the forces of the Swedish Empire. Painting by Frederik Christian Lund.

Seeing an opportunity to tear up the Treaty of Brømsebro, King Frederick III of Denmark, in 1657, declared war on Sweden, the latter being deeply involved in the Second Northern War (1655–1660), and marched on Bremen-Verden. This led to a massive Danish defeat as the armies of King Charles X Gustav of Sweden conquered Jutland and, following the Swedish March across the frozen Danish straits, occupied Funen and much of Zealand before signing the Peace of Roskilde in February 1658, which gave Sweden control of Scania, Blekinge, Bohuslän, Trøndelag, and the island of Bornholm. Charles X Gustav quickly regretted not having ruined Denmark and in August 1658, he launched a second attack on Denmark, conquered most of the Danish islands, and began a two-year-long siege of Copenhagen. King Frederick III actively led the defence of the city, rallying its citizens to take up arms, and repelled the Swedish attacks.^[42] The siege ended following the death of Charles X Gustav in 1660.^[43] In the ensuing peace settlement, Denmark managed to maintain its independence and regain control of Trøndelag and Bornholm.^[44] Attaining great popularity following the war, Frederick III used this to disband the elective monarchy in favour of absolute monarchy, which lasted until 1848 in Denmark.^[45]

Denmark tried but failed to regain control of Scania in the Scanian War (1675–1679). After the Great Northern War (1700–21), Denmark managed to regain control of the parts of Schleswig and Holstein ruled by the house of Holstein-Gottorp in the 1720 Treaty of Frederiksborg and the 1773 Treaty of Tsarskoye Selo, respectively. Denmark prospered greatly in the last decades of the 18th century due to its neutral status allowing it to trade with both sides in the many contemporary wars. In the Napoleonic Wars, Denmark traded with both France and the United Kingdom and joined the League of Armed Neutrality with Russia, Sweden, and Prussia.^[46] The British considered this a hostile act and attacked Copenhagen in 1801 and 1807, in one case carrying off the Danish fleet, in the other, burning large parts of the Danish capital. This led to the so-called Danish-British Gunboat War. British control of the waterways between Denmark and Norway proved disastrous to the union’s economy and in 1813 Denmark–Norway went bankrupt.

The union was dissolved by the Treaty of Kiel in 1814; the Danish monarchy “irrevocably and forever” renounced claims to the Kingdom of Norway in favour of the Swedish king.^[47] Denmark kept the possessions of Iceland (which retained the Danish monarchy until 1944), the Faroe Islands and Greenland, all of which had been governed by Norway for centuries.^[48] Apart from the Nordic colonies, Denmark continued to rule over Danish India from 1620 to 1869, the Danish Gold Coast (Ghana) from 1658 to 1850, and the Danish West Indies from 1671 to 1917.

Constitutional monarchy (1849–present)

The National Constitutional Assembly was convened by King Frederick VII in 1848 to adopt the Constitution of Denmark.

Liberal movement and cession of Schleswig and Holstein

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 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.

Industrialization

Industrialisation came to Denmark in the second half of the 19th century.^[49] 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 in World War I

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.^[50]

German Non-aggression pact and invasion

In 1939 Denmark signed a 10-year non-aggression pact with Nazi Germany but Germany invaded Denmark on 9 April 1940 and the Danish government quickly surrendered. 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. 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.^[51] 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 became a member of the European Union in 1973 and signed the Lisbon Treaty in 2007.

Denmark was a founding member of 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).^[52] 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.