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The american always have had advantage in boxing because it was invented there, they wre more likely to get a shot at the title, anyway as boxing was spreading in usa first but then spreaded in the rest of the world,
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Thats not true although boxing has been going on for 1000's of years, modern boxing first came about in around 1867, the Marquess of Queensberry rules were drafted by John Chambers for amateur championships held at Lillie Bridge in London england for Lightweights, Middleweights and Heavyweights. The rules were published under the patronage of the Marquess of Queensberry, whose name has always been associated with them.