Today, many Muslim countries have incorporated Islamic law in part into their legal systems. Certain Muslim states have declared Islam to be their state religion in their constitutions, but do not apply Islamic law in their courts. Islamic states which are not Islamic monarchies are usually referred to as Islamic republics, such as the Islamic republics of Afghanistan, Iran, Pakistan and Mauritania. Pakistan adopted the title under the constitution of 1956; Mauritania adopted it on 28 November 1958; and Iran adopted it after the 1979 Revolution that overthrew the Pahlavi dynasty. In Iran, the form of government is known as the Guardianship of the Islamic Jurists. Afghanistan was run as an Islamic state (Islamic State of Afghanistan) in the post-communist era since 1992, but then "de facto" by the Taliban (Islamic Emirate of Afghanistan) in areas controlled by them since 1996 and after the 2001 overthrow of the Taliban the country is still known as the Islamic Republic of Afghanistan. Despite the similar name, the countries differ greatly in their governments and laws. The Taliban took over the Islamic Republic of Afghanistan on 15th August 2021.