My famous question "Why are Kinder Surprise Eggs illegal in the USA?" became a hot network question, but the next day a moderator had removed it from the HNQ, which is irreversible.
So, why was my question removed from the HNQ list?
Questions on the HNQ is often the first impression people will get about our site. Ideally, only the best of our content should appear on that list.
Your question, while not bad, shows zero prior research effort. A quick look at the relevant Wikipedia article is enough to answer it. In fact, that's all the accepted answer does, point you to Wikipedia.
I removed the question because I do not think that is the content we should be advertising. It's hardly representative of the site, and it creates the false impression that we welcome ill-research questions. We don't, we really don't. Had your question been about a less affable subject, you'd probably get a fair amount of down-votes and wouldn't make it in the HNQ in the first place.