The Peloponnesus War began, in part, because of 1- Economic rivalries among Greek city-states
2- Threats of invasion by the Mycenaen’s
3- Alliances formed among Sparta and Persia
4- Arguments over control of the Delian League

after defeating german forces in north africa allied leaders turned their attention to "italy," since this was the location that made the most geographic sense before invading northern europe via france. 

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