Thank goodness the British and the Americans never crossed anyone else's borders.There are folks from all over the planet, including Mexico and China, crossing our (US) southern border these days.Next up: "Coins = Colonialism"
(TBH, for some years I thought it might be a bad idea to mix US, Mexican, and "Chinese" coins in a presentation -- even if the intention only involved the different colors and the convenient sizes.)
Really the idea I meant to present is that using props with obvious national or cultural associations might provide the wrong kind of misdirection and take the performance off the rails and might even spoil the whole social occasion.