Many children around the world do not have access to a school, and this makes things harder for them to make it farther in life. Without proper education there are little to no job opportunities for future adults, it is important we can provide free schooling for the less fortunate so we can keep sustainable education.
Answer: I don't know of the book you read, but..
Authors use historical times and revise them in such a way it's believable, immersive, and informative. They make sure their use of history isn't changed into an outlandish fashion to fit the time it's set in. They usually do this because you can't go back in history and show them what happened, so you must create a fictional yet historical piece to preserve the time.
The different religious beliefs
sometimes
It can by the story it has told
Because it helps life go right
Because of laws and religions the reasons of the story