From The Christian Science Monitor:
The Iraq war dominated his presidency, but it isn't the only signature foreign-policy event of his tenure.
Washington - Of all President Bush's foreign-policy decisions, the one to invade Iraq and topple dictator Saddam Hussein will no doubt have the greatest and broadest impact in the years to come.
The unfinished Iraq war – from its staggering cost to the way it distracted America from other global issues to its unintended result of elevating Iran as a regional power – has come to define the Bush presidency, at least in the arena of international affairs. If a stable and relatively democratic Iraq eventually emerges from the initially chaotic venture, Mr. Bush's stock – and his legacy – will rise.
But as of this moment, the president's venture in Iraq is described variously as "a colossal blunder" and, a bit more charitably, as a failure to recognize the advent of a geopolitical shift in which superpower muscularity was giving way to a more multipolar world.
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My Comment: The response to the world's financial/credit crisis is another policy that I would add.