Is the Khilafah state solely for Muslims?

Islam is a universal message for all of mankind. Many ayah in the Qur’an outline that Islam has come for all of mankind. Non-Muslims who live within the Khilafah territories are citizens and enjoy all the rights of security, opportunity and prosperity like any other citizen. Throughout most of Islamic history Muslims were the minority, 
According to Albert Hourani, the English historian, in his book: ‘A History of the Arab Peoples: “At the end of the Umayyad period, less than 10% of the people in Iran, Iraq, Syria, Egypt, Tunisia and Spain were Muslim. Only on the Arabian peninsula was the proportion of Muslims among the population even higher than this.”