In 1397, the Kalmar Union was formed, with the three Scandinavian countries under a single monarch. Olaf II, ruling from 1015 to 1030, unites the whole region under one crown. In 1389, the crowns of Denmark, Norway and Sweden were united under the rule of the Danish Queen Margareta. Sweden’s capital and largest city is Stockholm. In the first quarter of 2009, the GNP of Norway surpassed Sweden's for the first time in history… Thousands of mainly young Swedes migrated to Norway for work during these years, which is easy, as the labour market and social security systems overlap in the Nordic Countries. From as … …treaty between Sweden and Denmark-Norway that concluded a generation of … It occupies the greater part of the peninsula, which it shares with Norway. Sweden, country located on the Scandinavian Peninsula in northern Europe. The Homann Map of Scandinavia, Norway, Sweden, Denmark, Finland, Estonia, Livonia and northern Poland, from 1730, by Johann Baptist Homann (1664–1724) The History of Sweden can be traced back to the melting of the Northern Polar Ice Caps. The land slopes gently from the high mountains along the Norwegian frontier eastward to the Baltic Sea. Later other nations acceded to the treaty. Norway has only a few years previously become a single kingdom. Japan, New Zealand, Norway, South Africa, the Soviet Union, the United Kingdom, and the United States), the treaty was enacted on June 23, 1961. Sweden achieves similar unity rather later; not until the dynasty established by Birger Jarl in the 13th century does the Swedish kingdom have the stature to match Denmark or Norway.