Saudi Arabia is the birthplace of Islam and home to Islam's two holiest shrines in Mecca and Medina. The king's official title is the Custodian of the Two Holy Mosques. The modern Saudi state was founded in 1932 by ABD AL-AZIZ bin Abd al-Rahman Al SAUD (Ibn Saud) after a 30-year campaign to unify most of the Arabian Peninsula. One of his male descendants rules the country today, as required by the country's 1992 Basic Law. King ABDALLAH bin Abd al-Aziz ascended to the throne in 2005. Following Iraq's invasion of Kuwait in 1990, Saudi Arabia accepted the Kuwaiti royal family and 400,000 refugees while allowing Western and Arab troops to deploy on its soil for the liberation of Kuwait the following year. The continuing presence of foreign troops on Saudi soil after the liberation of Kuwait became a source of tension between the royal family and the public until all operational US troops left the country in 2003. Major terrorist attacks in May and November 2003 spurred a strong on-going campaign against domestic terrorism and extremism. King ABDALLAH since 2005 has worked to incrementally modernize the Kingdom - driven by personal ideology and political pragmatism - through a series of social and economic initiatives, including expanding employment and social opportunities for women, attracting foreign investment, increasing the role of the private sector in the economy, and discouraging businesses from hiring foreign workers. The Arab Spring inspired protests - increasing in number since 2011 but usually small in size - over primarily domestic issues among Saudi Arabia's majority Sunni population. Riyadh has taken a cautious but firm approach by arresting some protesters but releasing most of them quickly, and by using its state-sponsored clerics to counter political and Islamist activism. In addition, Saudi Arabia has seen protests among the Shia populace in the Eastern Province, who have protested primarily against the detention of political prisoners, endemic discrimination, and Bahraini and Saudi Government actions in Bahrain.