President Bush used the fifth anniversary of the Sept. 11 attacks on Monday to tell Americans that they were engaged in “a struggle for civilization” that would be determined in part by the course of the war in Iraq. “The safety of America depends on the outcome of the battle in the streets of Baghdad,” Mr. Bush said. In a prime-time speech from the Oval Office, delivered after a day of solemn ceremonies, Mr. Bush sought to place the war in Iraq in the context of an epic battle between tyranny and freedom, saying the campaign against global terrorism was...