What things caused the Islamic empire to grow?

Answer 1

I can answer this question by two ways...one as i am Muslim other as a reader in history

i will use the 2nd one

what happened that all people in other nations lived for there interest

but Muslims lived to help others

on other hand we should be fair and say Muslims were fair,justice when they defeat enemies

Answer 2

Muslim empire expanded by true faith, justice, human will respect, the inherent truthfulness in Islam religion and Quran divinity, good morals, and by will of God.

For information refer to the question below.

Answer 3

Islamic Empires expanded by conquest. The armies of the Islamic Caliphates were fighting an expansionary war for territory just as every other empire did in those days. Many Muslims claim that these empires expanded peacefully. They did not, but by the sword as no country just opens it doors to a new power. In fact, Muslims are very proud of their conquest of the Byzantine Empire and the "liberation" of its territories under General Khaled ibn Waleed and the destruction of the Sassanid Zoroastrian Persian Empire under General Sa'ad ibn Waqas. Some particularly useful examples, due how thoroughly they have been researched are: the Muslim Conquest of Iberia, the Mughal Conquest of central India, and Ottoman expansion into the Balkans. However, even lightly researched expansions, such as the conquest of the Maghreb, have also been demonstrated to be through acts of war and violence.

It is important to avoid conflating the militaristic expansion of the Islamic Caliphates (the empires) and any insinuation that forced conversion to Islam (the religion) occurred. This imperial expansion did not lead to the requirement for the now-conquered peoples to convert to Islam or die in most situations; Non-Muslims were generally allowed to continue their beliefs provided that they accepted a second-class status. (There were some cases of forced conversion, but these are in the minority.) Regardless, many citizens of newly conquered territories did convert either because they saw the Truth of the religion or to gain from the tax, work-related, and legal benefits that came from conversion. As a result the massive expansion of these empires was the primary method of gaining converts.

To read more about the second-class status of Non-Muslims in Islamic Empires, please see this Related Question: What was the treatment of Non-Muslims under Muslim rule?

To read about one of the cases of forced conversion to Islam, please see this Related Question: Did Aurangzeb try to force Hindus to convert to Islam?

Answer 4

the Islamic empire grew because the people there kept having babies

:-)