Why was the spread of Islam increased the importance of Mecca as a?

The spread of Islam significantly increased the importance of Mecca as it became the religion's spiritual center and a focal point for Muslim pilgrimage. The Kaaba, located in Mecca, is considered the holiest site in Islam, and the annual Hajj pilgrimage attracts millions of Muslims worldwide, reinforcing Mecca's status. Additionally, as Islam expanded, Mecca emerged as a vital hub for trade, culture, and religious instruction, further solidifying its significance in the Islamic world.