Answer:
While Mesopotamia's soil was fertile, the region's semiarid climate didn't have much rainfall, with less than ten inches annually. This initially made farming difficult. Two major rivers in the region - The Tigris and Euphrates - provided a source of water that enabled wide-scale farming.
Explanation:
Geography Mesopotamian's changed their environment to improve life, rivers support agriculture? Semiarid climate - hot summers, less than 10 inches of annual rainfall. Crops grew in this dry region because of rivers, fertile soil - many farming villages across southern Mesopotamia by 4000 B.C.
The alliances system meant that a local conflict could easily result into an intimidating global one. The overall cause of World War was the assassination of Archduke Franz Ferdinand. Nationalism was a great cause of World War one because of countries being greedy and not negotiating.
Your welcome I don't know if that helped. But yea.
Fertile land and food supplies would be the answer
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