history 101 questions

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This is a history class 101,

I need to answer all the question with complete thought and doesn’t have to be too long but be specific with the answer. Also each question should answer separately.

The crisis of the imperial order, 1900-1929

1. What the causes and events that led to the start of the First World War I ?

2. Why was the First World War considered a “Total War”

3. What were the causes for U.S. to shift from neutrality to intervention in the First World War?

4. Discuss the causes of the Russian Revolution of 1917 and what impact did it have on the outcome of the First World War?

5. How did the Middle East change as a result of the war?