Foreign relations of Belgium sanctioned the creation of Belgium in 1831 on the condition that the country remain strictly neutral. This policy of neutrality ended after the experience of German occupation during World War I. In the years preceding World War II, Belgium tried to return to a policy of neutrality, but once again, Germany invaded the country. In 1948, Belgium signed the Treaty of Brussels with the United Kingdom, France, the Netherlands, and Luxembourg, and one year later became one of the founding members of the Atlantic Alliance. The Belgians have been strong advocates of European integration, and most aspects of their foreign,
Partition of Belgium level, promotes the partition of Belgium and a union of Wallonia and Brussels with France. Several small parties with no or very few seats at the parliament campaign explicitly for the unity of the Belgian state. The conservative Belgian Union promotes a stronger federal government and a return to the Belgian unitary state which existed in the 1960s. The far-left Workers' Party of Belgium also supports the unity of Belgium since it considers the federalisation of the country as an employers' attack at the welfare state and the unity of the trade unions. The Francophone far-right Front National is also