Good divergent essential questions are important.  You need to take the time to develop the questions and Nick Dennis is right you cannot answer complex questions in one lesson.  They are enjoyable and thought provoking to answer but can be hard to make!  For example I am trying to think of a question so I googled divergent questions.  I found this: https://www.prodigygame.com/main-en/blog/convergent-divergent-thinking/ I will look at the Vietnam War.  Was the Vietnam war worth fighting for?  I know there is a difference of opinion on this and people can come to different conclusions. some think that it was necessary and the spread of communism (Domino Theory) was a threat to us while others thought it was more of a local nationalist occurence and we should not have gotten involved.