what was bismarcks main tool for uniting the german states?\nindustry\nwarfare\ndemocracy\ncapitalism

Brief Explanations:

Otto von Bismarck, the Prussian Chancellor, used a policy known as "Blood and Iron" (Blut und Eisen). This policy emphasized the use of military force (warfare) to achieve political goals. He led Prussia in several wars (such as the Austro - Prussian War in 1866 and the Franco - Prussian War in 1870 - 1871) which were crucial in unifying the German states under Prussian leadership. Industry, democracy, and capitalism were not the main tools he relied on for unification. Industry was more of an economic aspect that developed after unification to some extent, Germany at that time was not a democratic state (it had a strong monarchy), and capitalism was a broader economic system that was present but not the unifying tool.

Answer:

Warfare