Belgium is a country in Europe and member of major international organizations like the European Union and NATO which are both headquartered in Brussels, Belgium.
As a federal state, the Communities and Regions have their own foreign relations and are able to conclude treaties themselves.
Because of its location at the crossroads of Western Europe, Belgium has historically been the route of invading armies from its larger neighbours. With virtually defenceless borders, Belgium has traditionally sought to avoid domination by the more powerful nations which surround it through a policy of mediation. The Concert of Europe 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, economic, and trade policies are coordinated through the European Union (EU), which has its main headquarters (the European Commission, the Council of the European Union and sessions of the European Parliament) in Brussels. Belgium's postwar customs union with the Netherlands and Luxembourg paved the way for the formation of the European Community (precursor to the EU), of which Belgium was a founding member.