Check out this older answer by /u/paburon.

Hi there! You’ve asked a question along the lines of ‘why didn’t I learn about X’. Because of the additional body text ("were they worse Germany's?"), it violates our rule on poll type questions. You are welcome to resubmit your question considering the following poinst:

Firstly, school curricula and how they are taught vary strongly between different countries and even even different states. Additionally, how they are taught is often influenced by teachers having to compromise on how much time they can spend on any given topic. More information on your location and level of education might be helpful to answer this question.

Secondly, we have noticed that these questions are often phrased to be about people's individual experience but what they are really about is why a certain event is more prominent in popular narratives of history than others.

Instead of asking "Why haven't I learned about event ...", consider asking "What importance do scholars assign to event ... in the context of such and such history?" The latter question is often closer to what to what people actually want to know and is more likely to get a good answer from an expert.

Thank you!