Question

what did otto von bismarck do to achieve his goal of drawing smaller german states to prussias side?
outlawed the catholic church in german states
declared wilhelm i king of a united germany
started a war with france
invaded the territories of alsace and lorraine

Explanation:

Bismarck used the Franco-Prussian War (starting conflict with France) to rally smaller German states, who saw a common external threat, to align with Prussia. The other options are incorrect: he did not outlaw the Catholic Church (though he had a Kulturkampf, it was not outlawing), declaring Wilhelm I emperor was a result of unification, and Alsace-Lorraine was seized after the war as a result, not a unification tactic.

Answer:

started a war with France