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Garbrielle Princip assasined Franz Ferdinad
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Austria- Hungary decided after the assasination that declaring war on Serbia was the correct decision.
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Austria-Hungary declared war on Serbia, causing them to have to join war.
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Russia declares war on Germany, having Serbia's back
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Germany declares war against Russia after Russia did not stop mobilizing against Austria- Hungary
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Belgium joined war when German troops invaded Belgium
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France declares war on Germany hours after Germany declares war on France
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Britain declared war when Germany attacked France through Belgium.
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After signing the Treaty of London, Italy declares war on Austria- Hungary
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Bulgaria allied with Central Powers for economic reasons, causing them to join World War 1
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Declares war on Germany due to Uboat warfare, blocking Portugal to trade
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Romania signs a treaty with the allies, leading them to join war due to being upset with Austria- Hungary on territory issues
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Greece declares war on Central Powers, joining forces with the allies
