The 2003 U.S. led-invasion and subsequent occupation of Iraq planted deep roots of resentment towards their government. One that is Shia dominated.
"There's an important divide between Arab Sunnis and Shias in Iraq. The Islamic State in Iraq and the Levant (ISIS), a Sunni group, has grown powerful by exploiting Sunni discontent with Shia Prime Minister Nouri al-Maliki's government."
Iraq is out of control; however, it's not the United States's job to liberate a country that doesn't want the Western kind of democracy. Most Middle Eastern countries seek some of theocracies, Islam.
Sending troops in, as some suggest, would be a miscalculation, the reality is the people of Iraq want their own borders. They want a second of Iraq to be for Shia and one part for Sunnis and finally a part of the country for Ethnic Kurds. The only thing America will do is stir the pot of dissatisfaction with the west.
Invading Iraq in 2003 was a horrible idea. One made without any understanding of the dire consequences and the sectarian conflict that would ensue because of the destabilization within the region. Not to mention the fact that the new government isn't inclusive, and there's a sense of alienation among the Iraqi's because of this, hardcore idealist gain momentum in their push to overthrow the government and setup an Islamic State. One opposed to the west, and a government that endorses a strict form of Sharia Law. To make matters more complicated, ethnic Kurds want their own territory, if you will. Today, the Kursih president stated he is willing to work with a new inclusive Iraqi government.
Zack Beauchamp. (20 June, 2014).The real roots of Iraq's Sunni-Shia conflict. Vox.http://www.vox.com/2014/6/20/5827046/who-are-sunnis-who-are-shias
2. Jay Solomon. (24 June, 2014). John Kerry Urges Kurdish Leaders to Support Baghdad Against ISIS. The Wall Street Journal. http://online.wsj.com/articles/john-kerry-to-meet-kurdish-leaders-1403590845