Struggle between Sunni and Shiite muslims centered on the nation of:
Iraq.
The conflict between Sunni and Shiite muslims emphasizes religious and political differences that have been faced throughout centuries since two religious leaders were chosen in 632 A.D.: Ali for the Shiites and Abu for the Sunnis. Nowadays the divide is often described as a political struggle for control centered on Iran, Syria, Lebanon, Yemen, Saudi Arabia, and Iraq.