War on the Korean Penninsula?

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I'm aure most of us have seen the news by now of the shelling of the South Korean island by North Korea. Increae in tensions in that part of the world are never a good thing and the fact that we will more than likely be involved should hostilities break out add to my personal concern. Granted, an increase in tensions here is not a new thing and they tend to happen when North Korea starts grooming a new leader (which they are currently doing). At some point, however, South Korea will get fed up and start firing back. It may not happen this time but maybe the next time. if this happens, at that point are we headed headlong into war? We (the US) would undoubtedly be pulled in given we have tropps there and alliances and such - what would that mean for us? Who else could be pulled into such a war and what could the reprecussions be? This could be the start of a scary time or in the end, like it has been in the past, much ado about nothing. What do you think?