They forced nations to go to war I think.
Is was about getting revenge for the Arch Duke Franz Ferdinand yet many countries has peace treatise with many others so they all attacked one one-another
Answer:Several causes for it is the emergence of capitalism, European imperialism, efforts to mine coal, and the effects of agriculture revolution.
Explanation:
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The original thirteen colonies flourished and developed into what became the fifty US states, thanks to ample resources and opportunities. This country's political geography was the consequence of many treaties and conquests that resulted in the country reaching from the Atlantic to the Pacific Ocean.