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This was a direct cause of WW1 because it caused tension between the inside and outside of Europe.
It was pan-Slavic nationalism that caused the assassination of Austria's Archduke.
This is a direct cause to WW1 because with all the nations in alliances if one got in a war it would escalate to almost every nation very quickly.
This helped start the war because Austria blamed Serbia for the murder of their Archduke. The war wouldn't of happened if they weren't so ready for war.