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After Franz Ferdinand was killed, Serbia and Austria-hungry went to war. Alliances enhanced the size of the war and it also set the two different sides once the war turned into World War. The different alliances began created tension before the Serbia and Austria-Hungry war broke out. Since most of the countries had the reassurance that if they began conflict they would be supported by other nations, it almost encouraged to seek conflict rather than other peaceful approaches.

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One of the biggest contributors to the start of WWI was Nationalism. Before the war, most Europeans believed in having some sort of cultural, economic, and military supremacy and dominance over other nations.

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France and Britain had created large worldwide empires and became very rich. They practiced Imperialism to expand their power. Other European countries, such as Russia and Germany, wanted to create their own vast empires. This caused competition and conflict between many countries throughout the world.

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Militarism was the policy of glorifying military power and keeping an army prepared for war. The policy of building a stronger military was judged relative to neighbors. This created universal paranoia that caused countries to search for more alliances.

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Alliances were one of the main reasons that the the war included more nations than just Serbia and Austria-Hungary. With the assassination of Archduke Ferdinand of Austria-Hungary, they waged war on Serbia. Due to alliances, Germany came to support Austria-Hungary and that brought in even more countries to defend both Serbia and Austria Hungary.

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The nationalism of the various countries throughout Europe also contributed to the extension of the war in Europe. Each country tried to prove their dominance and power and tried to be better than the other.

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Imperialism caused European nations to compete for territory around the world, which increased tensions.  These tensions caused the European nations to build up their armies and set the stage for war.​ The fight for control of new territories increased competition and a desire for greater empires. This led to an increase in confrontation that helped push the world into WWI.

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Prior to WW1 Britain had the strongest army, however the Germans wanted to keep up with the British so they began to a strong navy of their own. Germany also began to increase its standing army which lead to the countries around Germany to do the same.

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Before WW1 began, European nations would align themselves with other European nations who shared common aspects. They would provide assistance if any military action occurred-this was known as Alliances. There were 2 main alliances in Europe, the Triple Alliance and the Triple Entente. The Triple Alliance was an alliance between Germany, Italy, and Austria-Hungry. The Triple Entente consisted of France, England and Russia.

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Nationalism can be linked with two of the other major causes of WW1, imperialism and militarism. Nationalism is linked to imperialism because the people would take great pride in their nations empire building, they would also think of the other European nations as greedy, cruel, and insensitive.

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After the colonial period came to an end, developed nations wanted new sources of raw materials and more markets to utilize. European nations began to colonize in areas across Africa and Asia. European nations also began to compete for the land with the most resource rich areas.

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Due to the increase of nationalism throughout Europe, governments began to increase their spending on the armies and navies. Not only were these governments increasing the number of soldiers in their armies/navies, they also began to build and create new weapons. This lead to a new era of warfare across Europe.

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https://youtu.be/KGlmlSTn-eM

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The Roads to World War I: Crash Course European History #32