The region of Russia that is called the Derbent is the region that is predominantly Muslim. This was as a result of the Arab conquests in the eight century.
Koran indicates that the whole world should be muslim.
the language of Arabic was spread (answer for studyisland)
The religion of Islam was spread. (study island answer)
Many people in Western Africa converted to Islam.
Ignorance and barbarity, wherever it happened.
He became a leading general in the Muslim army from Medina. He then valiantly led the conquests of the Levant and of Mesopotamia in the 630s C.E. He became a military governor of Iraq and then retired to Syria.
Following is the list of major Islamic conquests and battles; Battle of Qadisiyyah Battle of Covadonga Battle of Carthage Battle of Guadalete Battle of Nihawand Battle of Jalula Battle of Sebastopolis Battle of Bridge Battle of Rasil Battle of Tours
The Turkish migrations greatly expanded and empowered the Muslim World. The Seljuks and Ottomans were responsible for the last two great Muslim Empires and conquests. It was the Ottomans who pushed the boundaries of Islam all the way to the Gates of Vienna. On the eastern edge, the Turkish migrations into Xinjiang Province led to the development of the Hui People (Muslim Chinese).
Calling another Muslim as Kafir (infidel) which can be a cause for killing another Muslim in extreme cases like for ISIS.
Jerusalem remained in Muslim hands
Mesopotamia became part of the Ottoman Empire in the 16th century as a result of the conquests of Suleiman the Magnificent.