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Austria-Hungary declared war on Serbia due to Serbia not meeting the ultimatum for the assassination of Archduke Franz Ferdinand.
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In response to Austria-Hungary's declaration of war, Russia mobilised her army on July 29th
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Germany saw Russia's mobilisation as an act of war,
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Germany thought that they would be sneaky and attack France through neutral Belgium.
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Britain had an alliance with Russia and France. Britain had also signed a Treaty to protect Belgium in 1838. Britain declared war on Germany.
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Due to an alliance with Britain, Japan declared war on Germany.
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Even though Italy was a part of the triple alliance, she refused to support Germany and Austria-Hungary, claiming that war was their fault.
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The USA was not interested in getting involved in a "European" war. The United states declared war on Germany.
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