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
Prince Adalbert of Prussia, the commander-in-chief of the North German Navy, was commissioned with finding the design of the new war ensign. Around 1850, he already had designed a number of potential war ensigns for a hypothetical German nation-state under Prussian rule, which never were adopted as the project was not realized at that time. He used his old ideas to design the new North German war ensign with heavy involvement of the Prussian King, leading to numerous changes, like the inclusion of the Iron Cross in its original shape.