What was the sacrifice made and why was it hard for them to make in Otto von Bismarck and nationalist speech?

In Otto Von Bismarck's nationalist speeches, the sacrifice often referred to was the willingness of the German states to relinquish some degree of sovereignty for the greater goal of unification under Prussian leadership. This was difficult because it required overcoming regional loyalties and historical rivalries, as many states were reluctant to cede power. Additionally, the fear of losing autonomy and identity made the prospect of unification a contentious issue among the various German territories. Bismarck's adept manipulation of nationalist sentiment helped to navigate these challenges, ultimately leading to the establishment of a unified German Empire.