France–Germany relations of the further integration of the EU. They are sometimes described as the "twin engine" or "core countries" pushing for moves. A tram straddling the Franco-German border, across the river Rhine from Strasbourg to Kehl, was inaugurated on the 28th of April 2017 symbolising the strength of relation between the two countries. Both France and Germany track their history back to the time of Charlemagne, whose vast empire included most of the area of both modern-day France and Germany – as well as the Netherlands, Belgium, Luxembourg, Switzerland, Austria, Slovenia, and northern Italy. The death of Charlemagne's son Louis the
History of Belgium empire in the Belgian Congo, which the government took over after a major scandal in 1908. Belgium was neutral but its strategic location as a pathway to France made it an invasion target for Germany in 1914 and 1940. Conditions under the occupation were severe. In the postwar period Belgium was a leader in European unification, as a founding member of what has become the European Union. Brussels is now host to the headquarters of NATO and is the "de facto" capital of the European Union. The colonies became independent in the early 1960s. Politically the country was once polarized