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With the invention of the machine gun it helped the side hold off pushes from the other side.
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His assassination was the event that sparked the cause of WWI.
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The first battle of WWI which germany won.
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This war had the introduction of planes and dog Fights
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The gas was very effective in the early stages of the war and helped germany win many battles.
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The sinking of the british liner the Lusitania inspired the U.S. to join the war.
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The revolution in Russia made them back out of the war because of the issues they had going on.
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Another tipping point that made the U.S. join the war. It was a note sent to mexico that told them to attack the U.S. in order to reclaim texas, New Mexico, Arizona, and Parts of California.
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The U.S. Joins the war on the Allied Powers side.
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This was the treaty that ended the war.