Jenkins brought his ear to British parliament where they decided that and a couple other incidents were enough to start a war with Spain. The war went from 1739 to 1741.
The war though never really ended. Instead of ending, the war - between Britain and Spain- became part of the war of the Austrian Succession- which is a topic for another day!
I hope you all - As I do - now know some thing new. I, for one, had no idea there was such a thing as the war of Jenkins' Ear.