Political aspects of Islam are derived from the Quran, ḥadīth literature, and sunnah (accounts of the sayings and living habits attributed to the Islamic prophet Muhammad during his lifetime), the history of Islam, and elements of political movements outside Islam. Traditional political concepts in Islam include leadership by elected or selected successors to Muhammad, known as Caliphs in Sunnī Islam and Imams in Shīʿa Islam; the importance of following the Islamic law (sharīʿa); the duty of rulers to seek consultation (shūrā) from their subjects; and the importance of rebuking unjust rulers. A significant change in the Muslim world was the defeat and dissolution of the Ottoman Empire (1908–1922). In the modern era (19th–20th centuries), common Islamic political themes have been resistance to Western imperialism and enforcement of sharīʿa law through democratic or militant struggle. Events such as the defeat of Arab armies in the Six-Day War, the collapse of the Soviet Union, the end of the Cold War and the fall of communism as a viable alternative have increased the appeal of Islamic movements such as Islamism, Islamic fundamentalism, and Islamic democracy, especially in the context of the global sectarian divide and conflict between Sunnīs and Shīʿītes, along with the popular dissatisfaction with secularist ruling regimes in the Muslim world. Pre-modern Islam Origins of Islam Early Islam arose within the historical, social, political, economic, and religious context of Late Antiquity in the Middle East. The second half of the 6th century CE saw political disorder in the pre-Islamic Arabian peninsula, and communication routes were no longer secure. Religious divisions played an important role in the crisis. Judaism became the dominant religion of the Himyarite Kingdom in Yemen after about 380 CE, while Christianity took root in the Persian Gulf. There was also a yearning for a more "spiritual form of religion", and "the choice of religion increasingly became an individual rather than a collective issue." While some Arabs were reluctant to convert to a foreign faith, those Abrahamic religions provided "the principal intellectual and spiritual reference points", and Jewish and Christian loanwords from Aramaic began to replace the old pagan vocabulary of Arabic throughout the peninsula. The Ḥanīf ("renunciates"), a group of monotheists that sought to separate themselves both from the foreign Abrahamic religions and the traditional Arab polytheism, were looking for a new religious worldview to replace the pre-Islamic Arabian religions, focusing on "the all-encompassing father god Allah whom