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The Tripple Alliance was formed first in 1882, then was renewed in 1902. The Alliance was between Germany, Italy, and Austria-Hungry. It was a defensive pact that stated
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In 1890 Wihelm II became Kaiser of Germany. Wilhelm II was a stuborn ruler and wished to show the world how strong Germany really was. This lead to the new Kaiser to build a great navy to match that of Britians.
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The Alliance of Russia & France showed to world powers uniting to match the power of the newly formed Alliance of Germany & Austria-Hungry.
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This was the start of training large armies and stockpiling of arms and weapons.
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The Tripple Entente was the Alliance that yet again reviled the Tripple Alliance of Germany, Italy, and Austria-Hungry.
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This was the start of Austria-Hungry's role in the creation of the "Powder Keg". This created hosilities between Austria-Hungry and Serbia which just wanted to unite all of the slavic groups in the balkans. Serbia was backed by Russia (being mostly slavic).
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This was the one explosion that started the first world war.
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This was the first declaration of war this event caused the WWI to start therefor starting the largest war the world has ever seen at the time.
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Great Britian declared war on Germany because they swore the neutrality of Belgium. When Germany declared war on Russia 2 days later they delcared war on france where their plan was to invade through Belguim. When invading through Belguim Great Britian declared war on Germany for this act.
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The Battle lines are drawn in eastern part of france then became known as the "Western Front". While of the German-Russian border the battle lines were drawn causing many countries to pick sides.