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U-Boats
- U-Boats where very stealthy and very fast, used by the Germans.

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Airplanes
- Airplanes improved a lot around the time of the war

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Gas Attack
- Gas attacks where frequent in trench warfare

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Machine Guns
-Machine guns where better than the old semi- automatic rifles.

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Tanks
-Tanks were key to battle

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Russia
-Tsar Nicholas II
- Vladimir Lenin
- Joesph Stalin

Germany
- Kaiser Whilliem II

USA
- Woodrow wilsion

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Spark- Assassination of archduke Franz Ferdinand

-Causes

-Militarism
-Alliances
-Imperialism
-Nationalism

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-USA introduced the open door policy
-China got split into spheres of influence
-Britain takes control of india

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1914-1918