Hello there :)
Sanctions from the First World War. At the end of the First World War, the countries decided that Germany would have restrictions. As in, they made Germany give up land, they also find them like crazy. They weren’t allowed to have a military or defense force. They had to make reparation for everything they had done.
Also the rise of the National Socialist Party. So, Hitler was practically a nobody at first, but, he got to the point where he made enough speeches and got enough of a rise out of a crowd that the members from that association elected him to the position he was in and grew from.
Hope this helps some >.<
