How did Arab make expansion easier?

The Arab expansion was facilitated by several key factors, including the unifying influence of Islam, which provided a common religious identity and motivation for conquest. Additionally, the weakening of neighboring empires, such as the Byzantine and Sassanian, created power vacuums that the Arabs could exploit. The use of highly mobile cavalry and effective military tactics also contributed to their rapid territorial gains. Furthermore, the promise of wealth and land encouraged local populations to either support or not resist the Arab forces.