1. Which of these is another name for "World War I"?
The World Calamity
The War to End All Wars
The Franco Prussian War
The War of Global Independence

the war to end all wars

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.