Answer:
lots of things made them leave
Explanation:
Drought was a big reason but also because the people weren't clean which probably caused health problems. There was also alot of pests and while animals among the area. There was also volcanos and violence happening. Archaologists were really unsure they thought they left abruptly, but now they say they were forced out because of the things that were there to endure.
At first, Theodore Roosevelt, who was commander-in-chief from 1901 to 1909, seemed an unlikely candidate for the 1912 presidential election. After backing his close friend William Howard Taft to serve as his successor, he disappeared on an extended hunting trip to Africa.
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The answer is:
1.) Russian second front against Germany.
2.) German post war division.
3.) Soviet assistance against japan.
4.)Post war international organization.
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I hope this helps :D