North Rhine-Westphalia (, ; ; ; ), commonly shortened to NRW (), is a state (Land) in Western Germany. With more than 18 million inhabitants, it is the most populous state of Germany. Apart from the city-states, it is also the most densely populated state in Germany. Covering an area of , it is the fourth-largest German state by size. North Rhine-Westphalia features 30 of the 81 German municipalities with over 100,000 inhabitants, including Cologne (over 1 million), the state capital Düsseldorf, Dortmund and Essen (all about 550,000 inhabitants) and other cities predominantly located in the Rhine-Ruhr metropolitan area, the largest urban area in Germany and the fourth-largest on the European continent. The location of the Rhine-Ruhr at the heart of the European Blue Banana makes it well connected to other major European cities and metropolitan areas like the Randstad, the Flemish Diamond and the Frankfurt Rhine-Main Region. North Rhine-Westphalia was established in 1946 after World War II from the Prussian provinces of Westphalia and the northern part of Rhine Province (North Rhine), and the Free State of Lippe by the British military administration in Allied-occupied Germany and became a state of the Federal Republic of Germany in 1949. The city of Bonn served as the federal capital until the reunification of Germany in 1990 and as the seat of government until 1999. Culturally, North Rhine-Westphalia is not a uniform area; there are significant differences, especially in traditional customs, between the Rhineland region on the one hand and the regions of Westphalia and Lippe on the other. As of 2019, the state has the largest economy among German states by GDP but is below the national average in GDP per capita. History Creation The state of North Rhine-Westphalia was established by the British military administration's "Operation Marriage" on 23 August 1946, by merging the province of Westphalia and the northern parts of the Rhine Province, both being political divisions of the former state of Prussia within the German Reich. On 21 January 1947, the former state of Lippe was merged with North Rhine-Westphalia. The constitution of North Rhine-Westphalia was then ratified through a referendum. Rhineland The first written account of the area was by its conqueror, Julius Caesar, the territories west of the Rhine were occupied by the Eburones and east of the Rhine he reported the Ubii (across from Cologne) and the Sugambri to their north. The Ubii and