Otto von bismarck is important in german history for a) leading the move to unify germany in the 19th century. b) supporting and co-founding the nazi party after world war i. c) planning the unsuccessful invasion of russia in world war ii. d) his attempts to overthrow the austrian king, frederick the great.

Correct  A) leading the move to unify Germany in the 19th century.

Explanation:

Otto von Bismarck was Minster President and Minister of Foreign Affairs for the Kingdom of Prussia.  He used Realpolitik (reality politics) methods to increase Prussian power and align other German states together with Prussia into the German Empire.  (He then became Chancellor of the German Empire.)   He helped create wars with neighboring countries to increase national pride among the German people.

The main wars that Bismarck provoked in order to rally German territories together around those militaristic causes were the Austro-Prussian War (1866) and the  Franco-Prussian War (1870-71).

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the steamboat is your answer.

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d.

the northwest territory became the most densely populated area in the u.s.