Denmark came to own Greenland through centuries of shifting Scandinavian unions, colonial claims, and international treaties that gradually concentrated sovereignty in the Danish crown.

Viking and Norwegian beginnings

  • Norse settlers from Iceland and Norway colonized parts of Greenland around 986, making it effectively a Norwegian dependency in the Middle Ages.
  • As Norway’s power declined and trade with the Norse Greenlanders collapsed, those settlements disappeared, leaving only Inuit populations on the island while Norway still held the formal claim.

Denmark–Norway and early Danish control

  • In the late Middle Ages and early modern period, the crowns of Denmark and Norway were united, so Norway’s overseas possessions, including Greenland, became part of the joint Danish‑Norwegian monarchy.
  • From 1721, Danish‑Norwegian missionaries and traders began “re‑colonizing” southern Greenland and in 1775 it was formally declared a colony, embedding it more directly in the kingdom’s mercantile system.

Treaty of Kiel and 19th‑century status

  • After the Napoleonic Wars, the Treaty of Kiel (1814) dissolved the Denmark–Norway union, giving mainland Norway to Sweden but leaving its North Atlantic colonies—Greenland, Iceland, and the Faroe Islands—under Danish control.
  • From then on, Greenland was a Danish colony in its own right, governed from Copenhagen and used for trade in hunting products and strategic projection in the North Atlantic.

20th‑century legal confirmation

  • Denmark asserted sovereignty over all of Greenland in 1921, extending earlier claims that had focused mainly on the southwest coast.
  • Norway challenged this by claiming “Erik the Red’s Land” in East Greenland, but in 1933 the Permanent Court of International Justice ruled in Denmark’s favor, confirming Danish sovereignty over the whole island.

From colony to self‑government (but still Danish realm)

  • In 1916, the United States tacitly recognized Danish rights to Greenland as part of the deal in which it bought the Danish West Indies (now the U.S. Virgin Islands), reinforcing Denmark’s status there.
  • Greenland shifted from colony to an integral part of the Kingdom of Denmark after World War II, gained home rule in 1979 and self‑government in 2009, but it formally remains part of the Danish realm rather than an independent state.

Bottom line: Greenland is Danish today not because of geography, but because Norway’s original claim passed into a joint Danish‑Norwegian monarchy, then stayed with Denmark after 1814 and was later upheld by international courts and diplomatic agreements.

Information gathered from public forums or data available on the internet and portrayed here.