How did the nazis and Khmer Rouge each rose?

The Nazi regime rose out of the dissatisfaction of the German people. After world war 1, Germany had to pay a lot for war repairs and were ordered to disarm and not even have a military. Because of the debt they didn't have any money for production or industry and this led to mass satisfaction from the people. When Hitler showed up, he told the people that he could fix it and make Germany great and the people believed him.

The Khmer Rouge was a Cambodian communist government that rose in power due to dissatisfaction following the colonization of the SEA region. They had support from the Northern Vietnamese army and also from China who were also communist countries. They managed to win the civil war and introduced a government that committed many atrocities.

This is how Nazis rise to power. Lead by Hitler himself, he promises tons of things for geemany. Germany didn't wanted to be a communist country in general. A good financial society for Germany promised to make Germany great again, as well as Germany were only keen to rely on Hitler because they didn't want Germany to become a communist countrey