Why would someone need to know background of United States history to become a citizen?

Citizens have an obligation to know history because… Studying and knowing history allows us to grow and become stronger from events that occurred in the past. ... History is just one way for us to learn what it is that we as individuals can do to make the world we currently live in a better place for generations to come.

monarchy doesn’t have to have the hereditary element. there have been elective monarchies in the past where you choose your king-for-life and when he dies elect someone else for the job.

the answer is selfishly. hope this !