England declared war on Spain in 1739, presumably because the Spanish severed the ear of English sea captain .

Robert Jenkins

Explanation:

The severance of the ear of Captain Robert Jenkins led to the declaration of the colonial war by the Britons on 19th October, 1739. The war lasted between 1939 till 1748. The war took place on the Carribean sea.

Today, the war is known as the War of Jenkins ear, coined after the British Captain. The war eventually triggered the War of the Austrian succession in which, most European countries participated.

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