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Here's an idea: why not take that billion and create a scholarship fund?
It seems to me that there's better use for this money than to simply remember the events of September 11: namely, to ensure that something as horrible as this doesn't happen again. And it seems to me that education is a better long-term solution than, say, economic sanctions and force projection.
Of course we should remember September 11. I'm just saying that as long as we're building something, perhaps it should be an investment in the future, not merely a remembrance of the past.