The perpetrators are described as the Nazis and their collaborators." What is a collaborator? What do you think it means for groups or nations to collaborate during times of war?

If the imperial dynasty had continued to rule china, it is most likely that a) the economy would have improved rather than weakened b) european nations would have gotten more of a foothold in china c) revolutionary groups would not have gained any power in the country d) communism would not have received support among the poor