There were tribes all over the place, practically each one spoke different languages and lived differently
Serbian ambition in the tumultuous Balkans region of Europe, Austria-Hungary determined that the proper response to the assassinations was to prepare for a possible military invasion of Serbia. After securing the unconditional support of its powerful ally, Germany, Austria-Hungary presented Serbia with a rigid ultimatum on July 23, 1914, demanding, among other things, that all anti-Austrian propaganda within Serbia be suppressed, and that Austria-Hungary be allowed to conduct its own investigation into the archduke’s killing. Though Serbia effectively accepted all of Austria’s demands except for one, the Austrian government broke diplomatic relations with the other country on July 25 and went ahead with military preparedness measures. Meanwhile, alerted to the impending crisis, Russia—Serbia’s own mighty supporter in the Balkans—began its own initial steps towards military mobilization against Austria.
It was located in the middle of the Arabian Peninsula linking Yemen (which had major trading ports) and the Levant. It was also a pilgrimage site so there were always people there for worship which encouraged trade as well.
Answer: The Treaty of Versailles might have caused the Great Depression. it put small states on Germany's borders, in eastern and central Europe. It eliminated Russia as a direct enemy of Germany, at least in the 1920s, and it removed Russia as an ally of France.
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