Flag of Germany
With the formation of the short-lived Weimar Republic after World War I, the tricolour was adopted as the national flag of Germany. Sixteen years later following World War II, the tricolour was again designated as the flag of both West and East Germany divided states in 1949. The two flags were identical until 1959, when the East German flag was augmented with the coat of arms of East Germany. Since reunification on 3 October 1990, the black-red-gold tricolour has become the flag of a reunified Federal Republic of Germany.
Reichskriegsflagge
The German war flag, which was slightly changed two times during the Wilhelmine Period (see gallery below), was in common use in World War I. It continued to have Prussia's national colours of black and white, the eagle of Prussia, the Nordic cross, with the German imperial black-white red tricolour in the upper canton with an Iron Cross. In 1919, the flags of Imperial Germany were scrapped and replaced by those of the Weimar Republic: a black-red-gold tricolour.