Sheesh I can get a cookie but you can just get the app Socratic it gives more info about it.
The first four Caliphs after the Prophet Muhammad are known as the Rightly Guided Caliphs (Rāshidūn); Abu Bakr,Umar, Uthman, and 'Ali.
Thirteenth, fourteenth, and Fifteenth
Because of China's isolation by natural barriers, there was not much trade outside of China, so China's economy was agriculture
The economy was not doing well, soldiers were coming home with horrible PTSD and after-shock, the great depression was going on, etc. :)
