Explain the historical circumstances that led to the historical development depicted in the image above. pls help me with this

Germany unification occurs while Austria-Hungary separation occurs.

Explanation:

In Germany, due to patriotism all the components are assembled and made as one country while in Austria-Hungary due to patriotism all sections are segregated from one another. The unification of Germany happens due to two combats, Prussia with Austria and Prussia with France. these two combats begins to patriotism in Germany and then violent nationalism happens which commences to first world war. This disunity among the Individuals ultimately led to the destruction of Austria.

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).