So, to find out what IS a cause of the war we need to know M.A.I.N. That means Militarism, alliances, imperialism, and nationalism. That would mean the choices that aren't causes are totalitarianism, defense, and industrialism.
Answer:
Hernando de Soto was a Spanish explorer and conquistador who participated in the conquests of Central America and Peru and discovered the Mississippi River.
I can't answer your second question since I know nothing about it, my apologies, but I hope that this will help answer about Hernando de Soto.
The Silk Road connected them to the Fertile Crescent and other western countries and gave them new goods . Before the Silk Road china suffered from isolation because of the natural boarders around it
