The war in Iraq is one of the most important issues of the 2008 presidential election. On March 20, 2003, the United States invaded Iraq and defeated the regular Iraqi army. But since then, Iraqi insurgents have waged a guerilla-style war against occupying U.S. troops, and civil unrest has remained. The United States has averaged 140,000 troops in Iraq since the occupation began. The debate about the war includes other issues about the conflict, like terrorism, torture and America’s security.