What allowed Pol Pot and the Khmer Rouge to easily gain power?

During world war ll, the untied states was a member of the allies axis european theater pacific theater

Following archduke franz ferdinand's assassination, austro-hungarian leaders: a. aided the ottoman empire in its campaign to keep serbia under its control. b. executed nearly all prominent serbs living in austria-hungary c. threatened to invade serbia if serb leaders did not agree to a set of strict demands. d.. formed an alliance with great britain to protect austria-hungary from future attacks.

Who was on trial at the nuremberg trials a) japanese military officials. b)nazi leaders. c) communist germans