It doesn't.
Bismarck hijacked ideas proposed and put forth in the left-wing which is what he did all through his political career. Bismarck never created or innovated anything on his own.
If Bismarck truly weakened the left-wing by appropriating their ideas why did the Imperial state feel the need to gerrymander (don't know what the German word for this is, but same thing) and otherwise restrict and repress opposition parties to his rule. If he was truly confident in his policies and his legacies he would have contested it in a fair electoral contest. The fact is that Bismarck's pragmatism divided and alienated him from his fellow Prussian conservatives and lost him many of his friends, and cultivated a personal authority that did not recognize any equal parties. Bismarck's support for healthcare also fell short in many respects from Social Democrat pitches and ideas and had to be substantially reworked and developed later on.
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1) Imperial Prussia also relied on cheap labor, you had an entire class of people called Junkers who owned plantations and agrarian and manorial estates much like the Old South with people working there for low wages. Then the Imperial Prussians got into colonialism in Africa and did some pretty awful things in Namibia. Bismarck's brand of bribe-the-left's-base worked in selected areas and so on, but that only addressed the class of German citizens who had some say in Imperial Germany (which was very small franchise).
2) "who were mostly just happy to be here and weren't really able to organize themselves" is complete hogwash. Immigrant workers on arriving in America were very active and important in unions and helped make unions into a major force in American, and world, affairs. The IWW, the Wobblies, which had many immigrants (such as the Swedish Joe Hill) were big players in putting forth many union goals and achievements, some of which are still on the books.
I don't know which Europeans you've been reading or been talking to, but this is Euro-nationalist claptrap.
Not always, not in all places, and not at all times. This is a childish, no infantile, simplification.
Your post on Europe strikes me as quite misinformed in several respects, to put it mildly, I suggest you read books on this subject and read more widely. Anything by Thomas Piketty albeit he might be too academic. But Tony Judt's POSTWAR is a good one-volume read for a start.