Yet he modeled the German constitution on the US Constitution.
There are hardly any similarity between the German constitution of 1871 and the US Constitution. Only thing they have in common is, that both constituted a federal state, but besides that, nothing.
I think suffrage was identical, for example.
The US Constitution has nothing to say about suffrage.
Meanwhile, in Germany the people were allowed an equal* vote for the one parliament that didn't wield real power.
*more or less
One similarity is that both constitutions were, by design, technically possible but ridiculously difficult to legally amend.