From the 8th to the 10th century the wider Scandinavian region was the source of Vikings.
They colonised, raided, and traded in all parts of Europe.
An industrialised exporter of agricultural produce in the second half of the 19th century, Denmark introduced social and labour-market reforms in the early 20th century that created the basis for the present welfare state model with a highly developed mixed economy.
The Constitution of Denmark was signed on 5 June 1849, ending the absolute monarchy, which had begun in 1660.
The Danish Vikings were most active in the eastern and southern British Isles and Western Europe.
They conquered and settled parts of England (known as the Danelaw) under King Sweyn Forkbeard in 1013, and France where Danes and Norwegians founded Normandy with Rollo as head of state.
In that case, Harald built six fortresses around Denmark called Trelleborg and built a further Danevirke.The remaining Jutish population in Jutland assimilated in with the settling Danes.A short note about the Dani in "Getica" by the historian Jordanes is believed to be an early mention of the Danes, one of the ethnic groups from whom modern Danes are descended.The tribal Danes came from the east Danish islands (Zealand) and Scania and spoke an early form of North Germanic.Historians believe that before their arrival, most of Jutland and the nearest islands were settled by tribal Jutes.Beginning in the 17th century, there were several cessions of territory to Sweden.