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The single event that started a chain of other events that led to World War 1 was the assassination of Archduke Ferdinand. This event took place in June of 1914. Archduke Ferdinand was the heir to the Austro-Hungarian throne.
The assignation Archduke Franz Ferdinand of Austria was the spark of WWI. He, and his wife, were killed by Gavrilo Princip in Sarajevo (the capital of the Austro-Hungarian province of Bosnia and Herzegovina).
The person most responsible for triggering World War 1 was Gavrilo Princip, Austrian Archduke Franz Ferdinand's assassin. This led to war between Serbia and Austria with Germany and other nations joining in to help either side.
Franz Ferdinand
The allied side. The assassination of Archduke Franz Ferdinand sparked a war causing Austria and its allies to declare war on Serbia and Russia. Soon, the allies of Serbia and Russia declared war on Austria. Then, when Great Britain and France declared war, the US wanted to help their allies, causing them to join the allies.