 Complete the following phrase:  In 1871, King William I was elevated to the status of Emperor Kaiser of a united Germany, and the Stadtschloss became the symbolic heart of the German Empire. The Empire was in theory a constitutional state, and from 1894 onwards, the new Reichstag building, the seat of the German parliament came to not only rival but overshadow the Stadtschloss as the Empires center of power. In conjunction with Germanys defeat in World War I, William II was forced to abdicate both as German Emperor and as King of Prussia. In November 1918, the Spartacist leader, Karl Liebknecht, declared the 