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.
Flag of Germany
Two other states that were created after the war, Rhineland-Palatinate (French zone) and Lower Saxony (British zone), chose to use the black-red-gold tricolour as their flag, defaced with the state's coat of arms. These two states were formed from parts of other states, and no colour combinations from these previous states were accepted as a new state flag. This led to the use of the black-red-gold for two reasons: the colours did not relate particularly to any one of the previous states, and using the old flag from the Weimar Republic was intended to be a symbol of the new democracy.