✔ 最佳答案
Hitler was appointed as Chancellor by President Hindenburg. Under the Weimar constitution the Chancellor was not directly elected, the President had the power to appoint him. Hindenburg was initially reluctant to give the Chancellorship to Hitler but eventually relented.
In 1933 the Reichstag passed the Enabling Act which allowed Hitler to rule by decree. The Nazis did not have a majority in the Reichstag, they had just over a third of the seats, but they got the Enabling Act passed with the support of the centrist and right-wing parties, who probably just wanted strong leadership and didn't realise how dangerous Hitler's programme would be for Germany. The SDP voted against it, the Communist deputies were all barred from attending.
I admit I do not know a lot about the circumstances leading up to Hitler's appointment as Chancellor, but I understand that democracy was very fragile in Germany anyway. The Weimar Republic was Germany's first attempt at a true parliamentary democracy, but many people saw it as a regime that was imposed on them by the victors after WW1, and therefore did not defend it as enthusiastically as they might have done.