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A Serbian Nationalist killed Archduke Ferdinand, so Austria-Hungary wanted revenge. This mess wouldn't have happened if the Archduke wasn't murdered.
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It was a result of Archduke Ferdinand's assassination. This officially began WWI. If Austria-Hungary didn't declare war on Serbia there might not even have been a war.
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Because Russia declared war on Austria-Hungary. Germany also wanted more resources. I chose it because Russia officially gets involved.
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Because France was an ally of Russia. France got involved in the War because it was an ally of Russia.
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Germany and Russia were against eachother. Russia was almost completely defeated. Was the battle that Russia and Germany were against only eachother.
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Trench warfare begins as soldiers on both sides dig in. This is where trench warfare starts.
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It 's effecting submarine blockades where even neutral merchant vessels were to be potential targets. Germany basically is declaring war on GB.
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It was the longest battle of WWI and the bloodiest.
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A peace treaty between Russia and the central powers. Peace finally starts to come between Russia and Germany.
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This officially ends WWI. Everyone is nice to eachother now.