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All trhe Alliances started to form and unify and when one country would get attacked its alliances would go and attack the country that is attacking their other alliance and this started more fighting when a country was attacked.
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Before the World War 1 imperialism was causing the increase of competion and desire of greater empires and that led to the increased the amount of confrontation bewtween countries.
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Different countries were trying to build more larger and powerful weapons and they were trying to make their armies bigger and that started to cause compettion.
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There was an increased demand and competion for colonies and natural resources, which came from imperialism you could take over by force or being nice and asking to take over.
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The Austria-Hungarian Archduke named Franz Ferdinand was assasinated by Gavrilo Princip.
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Austria declares war on Serbia
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Germany declares war on Russia
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Germany declares war on France
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The United Kingdom declares war on Germany after Germany invades Belgium.
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Japan declares war on Germany
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The British Passenger ship that had American passengers in it was sunk by some German U-boats and that caused the United States to go to war with Germany.
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The United States declared war on Germany
