Soviet anti-submarine aircraft from operating in the missile launch area. In return, Swedish scientists at the Royal Institute of Technology made considerable contributions to enhancing the targeting performance of the Polaris missiles. On 28 February 1986, the Social Democratic leader Prime Minister Olof Palme was assassinated. The murderer was never found. Shocked Swedes worried whether the nation had lost its innocence. In 1995, a few years after the end of the Cold War, Sweden became a member of the European Union and the old term "policy of neutrality" fell out of use. In a referendum held in 2003, the majority voted not to adopt the Euro as the country's official currency. Foreign Minister Anna Lindh was murdered just before the referendum. During the 1980s, Sweden attempted to preserve its model of capitalism plus a generous welfare state through what it called a "bridging policy." Unintended consequences became apparent in the 1990s. There was an economic crisis with high unemployment and several banks and companies going bankrupt. There was high inflation as well as overheated real estate and financial markets and a negative real rate of interest. After 1991, these factors caused a recession with high unemployment. There were political reverberations and businesses called for neoliberal government policies. By 2000, however, the positive trends dominated. Compared to the rest of Europe, unemployment in Sweden was low, while economic growth has been high, inflation low, the budget in balance, and the balance of payments positive. Historiography According to Lönnroth (1998) in the 19th century and early 20th century, Swedish historians saw their writing in terms of literature and storytelling, rather than analysis and interpretation. Harald Hjärne (1848–1922) pioneered modern historical scholarship. In 1876, he attacked the traditional myths of the social and legal conditions of ancient Greece and Rome inherited from the classical authors. He was inspired by German scholar Barthold Georg Niebuhr (1776–1831), a founder of modern German historiography. As a professor of history at Uppsala University, Hjärne became a spokesman for the Conservative Party and the Swedish monarchy by 1900. Hjärne had an enormous influence on his students and, indeed, on an entire generation of historians, who mostly became political conservatives and nationalists. Another movement emerged at Lund University around 1910, where critical scholars began using the source critics' methods to the early history of Scandinavia. The brothers Lauritz Weibull and Curt Weibull were the leaders, and they had followers