In 1938, vast reserves of oil were discovered in the Al-Ahsa region along the coast of the Persian Gulf, and full-scale development of the oil fields began in 1941 under the US-controlled Aramco (Arabian American Oil Company).
Porén, en 1938 atopáronse grandes reservas de petróleo na rexión de Al-Hasa ao longo da costa do golfo Pérsico, e o desenvolvemento a grande escala dos campos petrolíferos comezou en 1941 baixo a empresa controlada polos Estados Unidos Aramco (Arabian American Oil Company).