These teachings were supported by the working people of the lower class Arabs. Islamic teachings have also been enshrined as laws in some countries that believe in Islam for a long time. In the early days of Muhammad's founding of Islam, he did not receive a response from many people. Instead, he was opposed by some wealthy merchants and slave-owning nobles in Mecca. Because Islam is a monotheistic religion, it is extremely incompatible with the traditional polytheism of the Quraishi tribe. At the same time, the idea of ??giving alms to the poor put forward in the teachings also harmed the economic interests of the great nobles and wealthy businessmen. Some nobles and wealthy businessmen were always ready to murder him. In this dangerous situation, late at night on July 16, 622, Muhammad led his followers to leave Mecca and migrate to Yatrib. This was the "migration" of Islam. Islam designated this year as It is the first year of the Islamic calendar. Yatrib was later changed to Medina, meaning City of the Prophet. Yatrib is different from Mecca in that it is not the center of rule by the stubborn Quraisi tribal aristocracy. Handicrafts and commerce are also very developed, and there are many poor people. Here, Islam was quickly accepted. On this basis, Muhammad promulgated the charter of the Islamic community, established a theocratic state, and established his own authority. Soon, the Mecca nobles launched an attack on Yatrib in an attempt to eliminate Muhammad's power. Muhammad organized the Yatrib believers, established his own army, fought many battles with the Mecca nobles, and defeated the attacks of the Mecca nobles. In 628, Muhammad and the nobles of Mecca signed an armistice treaty, which temporarily stopped the war between the two sides. In 630, Muhammad led an army to attack the city of Mecca. Under the pressure of the army, the nobles of Mecca were forced to accept Islam and recognized the authority and supreme status of Muhammad. In order to ease the hostilities at that time, Muhammad also recognized the special status and vested interests of the Mecca nobles. Soon, Muhammad established a theocratic state in Mecca with military, political, and religious power concentrated in him. After Muhammad entered Mecca, he cleared out all the tribal gods in the Kaaba Temple, retaining only the meteorite as a sacred object for all Muslims. He also changed the Kaaba Temple into a mosque and stipulated that every day A Muslim must make a pilgrimage here once in his life. Seeing how powerful the city of Mecca was, some tribes on the Arabian Peninsula sent envoys to express their willingness to convert to Islam and recognize Muhammad's status as a religious leader. In 632, Muhammad died of illness in Yatrib. By this time much of the peninsula had converted to Islam. Since then, Islam has spread to most parts of North Africa and Central Asia. By the 16th century, Muslims had spread all over the world. The emergence of Islam promoted the development of the Arab region, and also played a positive role in the unified development of the Arab region and in resisting foreign aggression. However, the doctrine in Islam that allows believers to engage in "holy war" makes it extremely aggressive in the process of preaching. It was in the name of "holy war", under the flag of the crescent moon, and waving their Arabian scimitars, the Islamists carried out violent expansion and established a huge Arab empire.