Schools in Saudi Arabia do not teach the 20th century history. Most of what they teach is about the Islamic empires, like the Abbasid Caliphate and the Ottoman Empire. However, there are books that talk about the 20th century, yet they are rare. Here is a website that has history books in Arabic. http://www.alkitab.com/s1050-history-series.html go there and see if they got what you want.