"Nie Wieder" refers to what?

Hint: 1889

quote:

Nie Wieder

("Never Again") is usually used in referring to the Holocaust, but can be asociated with other events as well; for your reference 0f 1889, it referred to the "Nie Wieder Krieg", or "No more war organization".

Close enough

The hint for 1889 though was to refer to the birth of Hitler. I was hoping that would lead to the answer you gave, but you got it anyways.