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.
Encouraging, successfully, German manufacturing.
That's a very special definition of economic conservatism.
Take the high tariffs on rye and wheat for example.
There was no economic importance for them (in fact they had a very bad influence on the working class, as basic foods became more expensive), except for keeping a completely out-dated social class, the Prussian
Junker, who relied on large-scale agriculture that became more and more inefficient and technically backwards, alive. Bismarck was one of them, and he tried (successfully) to conserve them as a political force against liberalism, socialism, democracy, progress in general.
He also ensured with the reform of the county law of 1872 that the
Gutsbezirke, local administrative divisions in which the local landlord was the judicial, police and often church authority and that bare any local government, continued in existence. If I remember correctly, about 1/4 of the Prussian population still lived in a
Gutsbezirk around 1900.
Why weren't the Old Conservatives supportive? Because Bismarck was well to the left of them.
Basically because they were ultra-royalists, and Bismarck broke the old dynastic legitimacy of Hannover and some other noble houses by annexing them and making them Prussian provinces. Also because German nationalism was, before 1871, a political goal of the liberals and democrats, not of the conservatives.
If in your mind this makes Bismarck "more left" than the ultra-royalist Prussian conservatives, fine, I'll give you that point.