While many political parties participated in Chad's legislature, the National Assembly, power laid firmly in the hands of the Patriotic Salvation Movement during the presidency of Idriss Déby, whose rule was described as authoritarian. After President Déby was killed by FACT rebels in April 2021, the Transitional Military Council led by his son Mahamat Déby assumed control of the government and dissolved the Assembly. Chad remains plagued by political violence and recurrent attempted coups d'état. It is a least developed country, ranking among the lowest in the Human Development Index. Chad is one of the poorest and most corrupt countries in the world; most of its inhabitants live in poverty as subsistence herders and farmers. Since 2003 crude oil has become the country's primary source of export earnings, superseding the traditional cotton industry. Chad has a poor human rights record, with frequent abuses such as arbitrary imprisonment, extrajudicial killings, and limits on civil liberties by both security forces and armed militias.