Two centuries of Viking raids tapered off following the adoption of Christianity by King Olav Tryggvason in 994. A period of civil war ended in the 13th century when Norway expanded its control overseas to parts of the British Isles, Iceland, and Greenland. Norwegian territorial power peaked in 1265, but competition from the Hanseatic League and the spread of the Black Death weakened the country. In 1380, Norway was absorbed into a union with Denmark that lasted more than four centuries. In 1814, Norwegians resisted the cession of their country to Sweden and adopted a new constitution. Sweden then invaded Norway but agreed to let Norway keep its constitution in return for accepting the union under a Swedish king. Rising nationalism throughout the 19th century led to a 1905 referendum granting Norway independence. Although Norway remained neutral in World War I, it suffered heavy losses to its shipping. Norway proclaimed its neutrality at the outset of World War II, but was nonetheless occupied for five years by the Third Reich. In 1949, neutrality was abandoned and Norway became a founding member of NATO. Discovery of oil and
Two centuries of Viking raids tapered off following the adoption of Christianity by King Olav Tryggvason in 994. A period of civil war ended in the 13th century when Norway expanded its control overseas to parts of the British Isles, Iceland, and Greenland. Norwegian territorial power peaked in 1265, but competition from the Hanseatic League and the spread of the Black Death weakened the country. In 1380, Norway was absorbed into a union with Denmark that lasted more than four centuries. In 1814, Norwegians resisted the cession of their country to Sweden and adopted a new constitution. Sweden then invaded Norway but agreed to let Norway keep its constitution in return for accepting the union under a Swedish king. Rising nationalism throughout the 19th century led to a 1905 referendum granting Norway independence. Although Norway remained neutral in World War I, it suffered heavy losses to its shipping. Norway proclaimed its neutrality at the outset of World War II, but was nonetheless occupied for five years by the Third Reich. In 1949, neutrality was abandoned and Norway became a founding member of NATO. Discovery of oil and