What was the most direct cause of World War I?

The most direct cause was the assassination of Archduke Franz Ferdinand at Sarajevo on 28 June 1914.

Explanation:

the mongolian invasion of china and central asia resulted in a disruption of the silk road as the chinese garrisons lost support from the chinese kingdoms which fell under the mongols. however, as the mongols established a formal dynasty in china, the successors of genghis khan restored the garrisons along the silk road allowing the safe travel caravans again.

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