One interesting fact in the expansion of Islam is the rapidity of its spread. At the dawn, during Muhammad's life, the Arabian peoples were dispersed and regret different gods and objects. That time the tribes located generally in the southern part of the Arabian Peninsula, became quickly organized, moving to a new step of development and started the Caliphate, then for several years subdued vast lands on some mainlands. At first glance, it looks that all the staff was easy, but if we stare thoroughly, we will see a bit different situation.
The basis of this huge state goes back to the death of the Prophet, who gave rise to a new religion for Muslims. The earlies stage of this empire is Rashidun Caliphate. Muslims called it after the term embracing the reign of the earliest four Caliphs. Immediately after Muhammad 's death, Abu Bakr, the second Caliph, encounter the obstacles. New religion had not sit confidently in the brains of the Arabs, so many of them started to seek new still active idols. About every family had an own preacher, who the Arabs wanted to listen to. Apparently, if there would not be Muhammad, the Prophet's place was aimed by many other opponents. After a few years of internal wars, the first Caliph left the Caliph's place to his friend Umar. The second Caliph had to struggle with local tribes as well, but Umar was able to considerably extended the borders of the state. Probably because of Umar's lively military career, he was murdered by a Persian slave while praying.
The 3rd ruler, Uthman, also died violently. During his reign opposite sentiments against him raised, in spite of military success in the conquest of Persia and some other territories. After some violent actions the protesters stormed to Caliph's home and assassinated him during the studying the Koran. Usman's allies also determined to take revenge for their slain ruler and killed about 4 thousand opponents. Following ruler, Ali, took start with a battle known as the battle of the Camel. In short time the new caliph was assassinated by opponents woe were irritated with the crack in the Arabic society. Then Muawiya, a relative of the previous Caliph Uthman, who came to power, left the position to his son, thus disestablishing the period of the Rashidun Caliphate and establishing the Umayyad Caliphate.