Billboards with the slogans "Death to America — Death to Israel" have appeared in the Iraqi capital of Baghdad in recent days. There are at least five of the large signs in central Baghdad, some less than a mile from the U.S. Embassy, the Iraqi presidential palace and the national government's headquarters. The signs appear to be part of a campaign by Iran, carried out through proxy groups that directly threaten U.S. troops in Iraq, to demonstrate its strength and reach in the region as tension between Washington and Tehran threatens to explode into conflict. "The billboards erected in the streets of Baghdad are evidence of the government's inability to control pro-Iranian groups who want to drag Iraq into an international conflict that endangers the country's future on behalf of Iran," Atheel al-Nujaifi, the governor of Iraq's Nineveh province, said last week. "Death to America" billboards pop up in Baghdad. It's a message from Iran. They can't control them.