A herd of homeless people could be termed by definition an intermittent accidental community, albeit temporary and nonbinding with no written credo, agenda or Declaration of Independence, they are in fact declaring independence from the society in which they hover and by herding together they exhibit the herd mentality of most all humans effectively forging a temporary bond by banding together i.e community sharing commonalities.
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A nation like this would not really be a nation just a hoard or a group of people who are traveling they would then be called something like a hoard or band of people , go to http://bussinessmouse.googlepages.com
Merchants trading on a large scale, some entrepreneurs and early manufacturers.
we call ourselves oregonians
it is called a census
People from Havana the capital of Cuba are called Havanan or habanero (m), habanera. (f)