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Germany created an allience with Austro-Hungary and agreed to help each other if Russia attacks either of them.
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Killing Archduke Franz Ferdinand (the next king of Austria) has made Austria want to declare war with Serbia.
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Ausrtria sent a list of demands to Serbia in reaction to the death of Archduke Franz Ferdinand.
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Serbia accepted 9/10 demands but the response was not acceptable to Austria so the Austria-Hungary declares war on Sebia.
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By Austria declaring war on Sebira, the Russian army supports Serbia as they have an allience with them.
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By Russia supporting Serbia in the war, Geramany declares war on Russia as they have an allience with Austro-Hungary.
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Germany declares war on France and invades Belgium.
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By Germany invading Belgium, Britain declares war with Germany and France, Also Australia, New Zealand and Canada join the war and support Britian.
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Austria-Hungary declares war on Russia for supporting Serbia and Serbia declares war on Germany for supporting Austria-Hungary.
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Britain and France declare war on Austria-Hungary starting WW1.