Berlin is one of the liveliest historical cities in Europe. During the Cold War, the city was divided amongst 4 countries: France, Great Britain, United States and the Soviet Union. In 1948 a blockade fell upon the city which prevented Western nations, access to the city which lay in the Soviet Union section of Germany. 4700 supplies were airlifted to individuals living inside the Western controlled region of Berlin. In 1961, the Berlin wall was built overnight to prevent emigration from East Berlin.