The colours black-white-red appeared for the first time only in 1867, in the constitution of the North German Confederation. This nation state for Prussia and other north and central German states was expanded to the south German states in 1870/1871, under the name German Empire. It kept these colours until the revolution of 1918/1919. Thereafter, black-white-red became a symbol of the political right, especially the radical right. The national socialists in 1933 re-established these colours along with the party's own swastika flag. After World War II, black-white-red was still used by some conservative groups or by groups of the far right - as it is not forbidden, unlike proper national socialist symbols.