Conversation so far:
When was Otto Von Bismarck dismissed by Wilhelm II, German Emperor?
In 1890.
Who replaced Otto Von Bismarck after he was dismissed?
Bismarck resigned at Wilhelm II's insistence in 1890, to be succeeded as Chancellor of Germany and Minister-President of Prussia by Leo von Caprivi.

Question: what reason did he have for dismissing Bismark?
Self-contained rewrite: what reason did  Wilhelm II, German Emperor have for dismissing Otto Von Bismark?