President Trump has faced an unavoidable showdown.Iran gleefully spent almost half a century waging economic and military warfare against the United States.This horror show cost Americans trillions and killed hundreds of U.S. troops through proxy attacks and direct acts of terror.AdvertisementFrom the 1979 oil production collapse that plunged output from 6 million barrels per day to 1.5 million, sending global oil prices from $15 a barrel to $39 per barrel, to the 1996 Khobar Towers bombing that killed 19 Air Force personnel, Iran’s actions were lethal and costly.Every failed negotiation, every embargo, and every sanction merely highlighted Tehran’s refusal to...