Why Blockading Iran Could Lead to Global Disaster: This story first appeared on the TomDispatch website. It's a policy fierce enough to cause great suffering among Iranians —and possibly in the long run among Americans, too. It might, in the end, even deeply harm the global economy and yet, history tells us, it will fail on its own. Economic war led by Washington (and encouraged by Israel) will not take down the Iranian government or bring it to the bargaining table on its knees ready to surrender its nuclear program. It might, however, lead to actual armed conflict with incalculable consequences. The United States is already effectively embroiled in an economic war against Iran. The Obama administration has subjected the Islamic Republic to the most crippling economic sanctions applied to any country since Iraq was reduced to fourth-world status in the 1990s. And worse is on the horizon. A financial blockade is being imposed that seeks to prevent Tehran from selling petroleum, its most valuable commodity, as a way of dissuading the regime from pursuing its nuclear enrichment program. Historical memory has never been an American strong point and so few today remember that a global embargo on Iranian petroleum is hardly a new tactic in Western geopolitics; nor do many recall that the last time it was applied with such stringency, in the 1950s, it led to the overthrow of the government with disastrous long-term blowback on the United States. The tactic is just as dangerous today.