I love it when foreigners know more about American history than we do.Funny story behind that - The Boston Tea Party.
The English imposed a 10% tariff on luxury goods going to America, including Tea.
The Americans revolted over this, massive riots and they tipped contents of ships in to the harbour in protest.
The English conceded to drop the tariff and the Americans believed that they had won a great battle.
Ever after the English sold the Americans smaller "gallons" of only 7 pints instead of 8. So now instead of getting the extra 10% they asked for they were now getting 12.5% extra on their goods.
Pieces of eight.
Of course I know about the Boston tea party. But the 7 pint gallon? Never heard that before.