As an English-American dual citizen living in Europe, I consider myself a citizen of the world, and my interests are spread across all three places (and Russia, which I visit a lot). Eventually I may be interested in conducting or facilitating business between all four regions.
Like my father, I was born in Canada, but I have traded that citizenship for American and British. Canada still considers me a citizen but I no longer have any ties to it (aside from relatives) and my passport has long since expired. Triple citizenship is not really legal so officially I am only considered American and British. I inherited my British citizenship by descent (though I've never actually lived in the UK) and became a naturalized US citizen through marriage in 2011 (and subsequent divorce).