the Treaty of Kiel. Sweden and Norway were thus united under the Swedish monarch, but Finland's inclusion in the Russian Empire excluded any possibility for a political union between Finland and any of the other Nordic countries. The end of the Scandinavian political movement came when Denmark was denied the military support promised from Sweden and Norway to annex the (Danish) Duchy of Schleswig, which together with the (German) Duchy of Holstein had been in personal union with Denmark. The Second war of Schleswig followed in 1864, a brief but disastrous war between Denmark and Prussia (supported by Austria). Schleswig-Holstein was conquered by Prussia and after Prussia's success in the Franco-Prussian War a Prussian-led German Empire was created and a new power-balance of the Baltic Sea countries was established. The Scandinavian Monetary Union, established in 1873, lasted until World War I. Use of Nordic countries vs. Scandinavia The term Scandinavia (sometimes specified in English as Continental Scandinavia or mainland Scandinavia) is ordinarily used locally for Denmark, Norway and Sweden as a subset of the Nordic countries (known in Norwegian, Danish, and Swedish as ; , , ). However, in English usage, the term Scandinavia is sometimes used as a synonym or near-synonym for what are known locally as Nordic countries. Usage in English is different from usage in the Scandinavian languages themselves (which use Scandinavia in the narrow meaning), and by the fact that the question of whether a country belongs to Scandinavia is politicised, people from the Nordic world beyond Norway, Denmark and Sweden may be offended at being either included in or excluded from the category of "Scandinavia". Nordic countries is used unambiguously for Denmark, Norway, Sweden, Finland and Iceland, including their associated territories Greenland, the Faroe Islands and the Åland Islands. A large part of modern-day Finland was part of Sweden for more than four centuries (see: Finland under Swedish rule), thus to much of the world associating Finland with Scandinavia. But the creation of a Finnish identity is unique in the region in that it was formed in relation to two different imperial models, the Swedish and the Russian. There is also the geological term Fennoscandia (sometimes Fennoscandinavia), which in technical use refers to the Fennoscandian Shield (or Baltic Shield), that is the Scandinavian Peninsula (Norway and Sweden), Finland and Karelia (excluding Denmark and other parts of the wider Nordic world). The terms Fennoscandia and Fennoscandinavia