History of Strasbourg remained neutral during the Thirty Years' War (1618-1648), and retained its status as a Free Imperial City. However, the city was later annexed by Louis XIV of France to extend the borders of his kingdom. Louis' advisors believed that, as long as Strasbourg remained independent, it would endanger the King's newly annexed territories in Alsace, and, that to defend these large rural lands effectively, a garrison had to be placed in towns such as Strasbourg. Indeed, the bridge over the Rhine at Strasbourg had been used repeatedly by Imperial (Holy Roman Empire) forces, and three times during the Franco-Dutch War
Institutional seats of the European Union At the founding of the European Coal and Steel Community (ECSC), the states could not agree which city should host the institutions of the new community. Brussels was widely preferred, but was vetoed by Belgium which insisted on Liège. Because of the impasse, Luxembourg was chosen as a provisional choice for all but the Assembly (Parliament), which was to be based in Strasbourg. Two further communities were created in 1957 and again a provisional agreement laid out that the Assembly would meet in Strasbourg, the Courts would meet in Luxembourg, and the Commissions and Councils would be split between Luxembourg