in Europe. The Swedish state expanded enormously into the modern Estonia and Latvia, northern Germany, and several regions that to this day are part of Sweden. Before the end of the 17th century, a secret alliance was formed between Denmark-Norway, Polish-Lithuanian Commonwealth, and Russia against Sweden. This coalition acted at the start of the 18th century when Denmark-Norway and the Polish–Lithuanian Commonwealth launched surprise attacks on Sweden. In 1721, Russia and its allies won the war against Sweden. As a result, Russia was able to annex the Swedish territories of Estonia, Livonia, Ingria, and Karelia. This effectively put an end to the Swedish Empire, and crippled her Baltic Sea power. Sweden joined in the Enlightenment culture of the day in the arts, architecture, science, and learning. Between 1570 and 1800, Sweden experienced two periods of urban expansion. Finland was lost to Russia in a war in 1808–1809. In the early 19th century, Finland and the remaining territories outside the Scandinavian Peninsula were lost. Sweden's last war was the Swedish–Norwegian War (1814). Sweden was victorious in this war, leading to the Danish king being forced to cede Norway to Sweden. Norway was then forced to enter into a personal union with Sweden that lasted until 1905. Since 1814, Sweden has been at peace, adopting a non-aligned foreign policy in peacetime and neutrality in wartime. During World War I, Sweden remained neutral, but let the Germans travel in the country. Post-war prosperity provided the foundations for the social welfare policies characteristic of modern Sweden. During World War II, Sweden once again remained neutral, avoiding the fate of occupied Norway. The country attempted to stay out of alliances and remain officially neutral during the entire Cold War, and declined to join NATO. The social democratic party held government for 44 years (1932–1976). The 1976 parliamentary elections brought a liberal/right-wing coalition to power. During the Cold War, Sweden was suspicious of the superpowers, but this sentiment lessened as the situation progressed, and Sweden continued to remain neutral. Prehistoric Sweden before AD 800 Sweden has a large number of petroglyphs (hällristningar in Swedish), with the highest concentration in the province of Bohuslän and the northern part of the county of Kalmar, also called "Tjust". The earliest images can be found in the province of Jämtland, dating from 5000 BC. They depict wild animals such as elk, reindeer, bears and seals. 2300–500 BC was the most