Why was Hitler gaining power in Germany?

Through the late 1920s and early 1930s, the Nazis gathered enough electoral support to become the largest political party in the Reichstag, and Hitler's blend of political acuity, deceptiveness, and cunning converted the party's non-majority but plurality status into effective governing power in the ailing Weimar

Explanation:

Hitler rose to power through the Nazi Party, an organization he forged after returning as a wounded veteran from the annihilating trench warfare of World War I. He and other patriotic Germans were outraged and humiliated by the harsh terms of the Treaty of Versailles, which the Allies compelled the new German

it would be  

germany had to pay all damages related to the war.

and i think

germany had to take sole responsibility for the war.

the congress realized that action had to be.