Why did sun yat sen resigned as a presidentire?

What is the name of the war that was Robert E. Lee's first war? What is a Pysanka? How many World Series have the Tampa Bay Devil Rays won and what year? Were cities built in Egypt built by slavery? How did proxy wars impact other people? How are the amendments categorized? What greek city state was characterized by creavity commercial endeavors and democrazy and individualism? What famous lion statue is with a human head? Do nuns shave their heads? How did queens of ancient mesopotamia rule? What was the common form of taxation during the colonial era? Who was Frederick M Jones family? The Carolingian Renaissance occurred during the rule of which Frankish King? Are your parents' first cousins your second cousins? How did Charles I affect England? Why did General Robert E. Lee raid Maryland in 1862? What colours did the roman use on their mosaics? Why coloured peoplewere not treated as well as the white people? What are the reasons that English wanted to colonize Jamestown? Why couldn't women participate in the Olympics in ancient Grease?

Why did sun yat sen resigned as a presidentire?