One of the rather odd things I've picked up over the years is a slightly different view of the concept of a social contract. The fact that X and Y are traditional enemies means that they have a specific, defined and accepted relationship already, which is part of a contract. This has some interesting implications since, I would argue, every nation state (barring possibly Andorra, Monaco and few others) are arbitrarily delineated "nations" that only bear a passing resemblance to an ethnoi.
As to whether or not such a contract can be established, sure it can and has been in a number of places: Canada, Belgium, and Switzerland all spring to mind as classic examples. The question, IMHO, should be more in line with how did such a multi-ethnoi social contract come into existence and why and how has it been maintained?
Cheers,
Marc
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