For centuries, Muslim Middle Eastern nations have been generally divided along denominational Sunni-Shia lines. The Sunni branch of Islam makes up 85 to 90 percent of all Muslims and are the dominant population in nations such as Saudi Arabia and Egypt, while Shias make up only about 10 to 15 percent of all Muslims and form majorities in nations such as Iran and Iraq. The Sunni-Shia divide has been a major source of division between many countries in the Middle East. However, times are changing.