Norwegians, like the Danes and Swedes, are of Teutonic origin. The Norsemen, also known as Vikings, ravaged the coasts of northwest Europe from the 8th to the 11th century and were ruled by local chieftains. Olaf II Haraldsson became the first effective king of all Norway in 1015 and began converting the Norwegians to Christianity. After 1442, Norway was ruled by Danish kings until 1814, when it was united with Sweden—although retaining a degree of independence and receiving a new constitution—in an uneasy partnership. In 1905, the Norwegian Parliament arranged a peaceful separation and invited a Danish prince to the Norwegian throne—King Haakon VII. A treaty with Sweden provided that all disputes be settled by arbitration and that no fortifications be erected on the common frontier.

When World War I broke out, Norway joined with Sweden and Denmark in a decision to remain neutral and to cooperate in the joint interest of the three countries. In World War II, Norway was invaded by the Germans on April 9, 1940. It resisted for two months before the Nazis took complete control. King Haakon and his government fled to London, where they established a government-in-exile. Maj. Vidkun Quisling, who served as Norway's premier during the war, was the most notorious of the Nazi collaborators. The word for traitor, quisling, bears his name. He was executed by the Norwegians on Oct. 24, 1945. Despite severe losses in the war, Norway recovered quickly as its economy expanded. It joined NATO in 1949.

In the late 20th century, the Labor Party and the Conservative Party seesawed for control, each sometimes having to lead minority governments. An important debate has been over Norway's membership in the European Union. In an advisory referendum held in Nov. 1994, voters rejected seeking membership for their nation in the EU. The country became the second-largest net oil exporter after Saudi Arabia in 1995. Norway continued to experience rapid economic growth into the new millennium.

In March 2000, Prime Minister Kjell Magne Bondevik resigned after parliament voted to build the country's first gas-fired power stations. Bondevik had objected to the project, asserting that the plants would emit too much carbon dioxide. Labor Party leader Jens Stoltenberg succeeded Bondevik. Stoltenberg and the Labor Party were defeated in Sept. 2001 elections, and no party emerged with a clear majority. After a month of talks, the Conservatives, the Christian People's Party, and the Liberals formed a coalition with Bondevik as prime minister. The governing coalition was backed by the far-right Progress Party.

For several years running, the UN's Human Development Index has rated Norway the world's “most livable” country. The index ranks nations according to their citizens' quality of life.