The answer is actually quite simple. After WWI, many countries that suffered loss and consequences afterwards were eager for revenge (Especially Germany). All that was needed was some random guy that can create good speeches and had both financial and military power (Such as Hitler) to show and the people easily accepted him. This happened to the majority of countries that were affected by the treaty of Versailles. (It's pronounced Ver-s-i)
Also a phrase to keep in mind is a scapegoat if u need the meaning just ask
Dictators rose in Germany, Italy, and Japan due to post-World War I economic hardships and political instability. Leaders like Adolf Hitler and Benito Mussolini capitalized on national humiliation and promises of stability to gain support. These conditions were further exacerbated by the Great Depression, which led to increased dissatisfaction with democratic governments.
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