@Ana1234 - I'm kind of glad that happens though, because it makes the language richer and it stops people from being too snobbish about it as well. I don't really approve of literature where too much of the understand of it depends on shared knowledge that a lot of people don't have access to. It is elitist, and, in some cases, very lazy to refer to historical events to add color to your own story.
One of the quick ways to allude to tragedy in young people, for example, is to bring up Anne Frank, but I think it is very difficult to do so without diminishing her story. Another woman who is often used in historical allusion is Helen Keller and she is often reduced to her disabilities, which is only a fraction of what she means to the world if you delve into her actual life.
I'm not against people ever making allusions, but they should be sparing and very carefully contemplated when they are historical, because they are talking about real people.