How did the assassination of ferdinand lead to ww1?

The assassination of the Archduke tripped a whole web of mutual defense treaties that existed throughout Europe and caused countries to declare war against other countries that they really didn't have any quarrel with.

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the colonists were also expected to pay a tax to meet the costs of establishing and manning the borders of the proclamation line which led to the belief that the king had sided with the indians despite pontiac's rebellion, against the interests of the settlers. this contributed to the causes of the american revolution.

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