Theres an American, a Frenchman and an Englishman sat around in a Bar all of a sudden a Genie appears and tells the 3 men that they all have one wish, but it cannot be something to their own personal gain.
After some deliberation the Patriotic American asks that America be plentiful in everything from now until the end of time, that the soils reap good harvest for the farmers, that the livestock is always fit and healthy and that the economy is the strongest in the world. The Genie says "It will be so.".
The Frenchman asks than a 500 meter impenetrable wall be built around France to keep all foreigners out. The Genie says "It will be so.".
The Englishman says "This wall you've just built, it's completely sealed and unbroken, there is no possible way through it in or out?". The Genie answers "Of course not, it is perfectly sealed".
The Englishman says "Fill it with Water".