Thank you for the opportunity to help you with your question!
Because it was the first event that convinced various international military and political groups into a global conflict. All the wars before that did not contain so many nations from the various continents. All the wars after that have now become wars for different countries. WWI have opened the door for any nations anywhere.
Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 3rd, 2015
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