People started to live in the area and call it Abu Dhabi about 300 years ago. In the 1970s, the Bani Yas tribe made Abu Dhabi their capital city. Shakhbut bin-Dhiyab Al Nahyan became the leader of the city in 1818. People found oil in 1958 in Abu Dhabi. They started to sell the oil in the 1960s. In 1971 December the 2nd, Abu Dhabi joined the United Arab Emirates and became the capital city.