Norwegians constitute both a nation and an ethnic group native to Norway. They share a common culture and speak the Norwegian language. Norwegian people and their descendants are found in migrant communities worldwide, notably in United States, Canada and Australia. Towards the end of the 3rd millennium BC, Proto-Indo-European speaking Battle-Axe peoples migrated to Norway bringing domesticated horses, agriculture, cattle and wheel technology to the region. During the Viking age, Harald Fairhair unified the Norse petty kingdoms after being victorious at the The Battle of Hafrsfjord in the 880s. Two centuries of Viking expansion tapered off following the decline of Norse paganism with the adoption of Christianity in the 11th century. During The Black Death,...'