Foreign relations of the Netherlands context of the Western European Union and the European Security and Defence Policy of the EU – and bilaterally, as in the German-Netherlands Corps. In recent years, the Dutch have become significant contributors to UN peacekeeping efforts around the world as well as to the Stabililzation Force in Bosnia and Herzegovina (SFOR) in Bosnia. The Dutch have been strong advocates of European integration, and most aspects of their foreign, economic, and trade policies are coordinated through the European Union (EU). The Dutch postwar customs union with Belgium and Luxembourg (the Benelux group) paved the way for the formation of the
Southern Netherlands Orange at the 1815 Congress of Vienna. The southeastern third of Luxembourg Province was made into the autonomous Grand Duchy of Luxembourg, because it was claimed by both the Netherlands and Prussia. In 1830 the predominantly Roman Catholic southern half became independent as the Kingdom of Belgium (the northern half being predominantly Calvinist). In 1839 the final border between the kingdom of the Netherlands and Belgium was determined and the eastern part of Limburg returned to the Netherlands as the province of Limburg. The autonomy of Luxembourg was recognised in 1839, but an instrument to that effect was not signed