The German Empire—often called the Second Reich…
1864 CE to 1875 CE
The first is between the king of Prussia and the rulers of the other German states, who agree to accept him as the kaiser (emperor) of a united Germany, provided they can continue to rule their states largely as they had in the past.
The second is the agreement among many segments of German society to accept a unified Germany
based on a constitution that combines a powerful authoritarian monarchy with a weak representative body, the Reichstag, elected by universal male suffrage.
No one is completely satisfied with the bargain.
The kaiser has to contend with a parliament elected by the people in a secret vote.
The people are represented in a parliament having limited control over the kaiser.