Greenland

Around 800 BC, the Saqqaq culture disappeared and the Early Dorset culture emerged in western Greenland and the Independence II culture in northern Greenland. The Dorset culture was the first culture to extend throughout the Greenlandic coastal areas, both on the west and east coasts, and it lasted until the arrival of the Thule culture in 1500 AD. The Dorset culture population lived primarily from whale hunting. The Thule culture people are the ancestors of the current Greenlandic population. They started migrating from Alaska around 1000 AD, reaching Greenland around 1300 AD. The Thule culture was the first to introduce to Greenland such technological innovations as dog sleds and toggling harpoons.
Norse settlement
From 986 AD, Greenland's west coast was colonised by Icelanders and Norwegians in two settlements on fjords near the southwestern-most tip of the island. They shared the island with the late Dorset culture inhabitants who occupied the northern and eastern parts, and later with the Thule culture arriving from the north. Norse Greenlanders submitted to Norwegian rule in the 13th century, and the kingdom of Norway entered into a personal union with Denmark in 1380 and from 1397 as a part of the Kalmar Union.