You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
alternatehistory.com
Here's a screen dump from Wiki:
The constitution was heavily amended in the waning days of World War I. The amended document, known as the Oktoberverfassung ("October Constitution") was debated and passed by the Reichstag in late October 1918. The most important changes were:
Declarations of war and peace treaties now required the assent of the Reichstag
Members of the government could now simultaneously be members of the Reichstag
The Reichskanzler and the Secretaries of State now required the confidence of the Reichstag. They were accountable for the conduct of their affairs to the Reichstag and to the Bundesrat
The Reichskanzler was now responsible for all political actions of the Emperor
The Emperor's rights to appoint, promote or reassign military officers were now limited by requiring the co-signature of the Reichskanzler or the Minister of War responsible for the contingent. The Ministers of War were now accountable to the Bundesrat and Reichstag for the management of their contingent
The changes came into force on 28 October, transforming the authoritarian Empire into a parliamentary democratic monarchy on the British model.
Could most or all of these changes occur before 1916 but after 1871? They don't all have to occur all at once, in fits and starts would be fine. Which would be the first to occur? What changes would occur if some or many were adopted?