Since the 19th century, many Muslims have aspired to uniting the Muslim "ummah" to serve their common political, economic and social interests. Despite the presence of secularist, nationalist and socialist ideologies in modern Muslim states, they have cooperated to form the Organisation of Islamic Cooperation. The formation of the OIC happened in the backdrop of the loss of Muslim holy sites in Jerusalem. The final cause sufficiently compelled leaders of Muslim nations to meet in Rabat to establish the OIC on September 25, 1969.