Burger King Worldwide Inc. (NYSE:BKW) announced it has agreed to buy Tim Hortons Inc. (NYSE:THI), a Canadian donut and coffee shop chain, for about $12 billion in cash and stock. Earlier on Tuesday, the Wall Street Journal, citing people familiar with the matter, reported Warren Buffett's Berkshire Hathaway would provide about 25 percent of the deal's financing. The deal also would effectively move Burger King’s base of operations from Miami to Canada in a so-called tax inversion -- a strategy that has been sparking outrage because it threatens U.S. tax revenues.

So, here's the question for Americans as they contemplate this latest deal.