The Arabian Peninsula has historically been an important trade center, located between Africa, Asia, and the Mediterranean. It was the origin of Islam and the Arabic language in the 7th century. Today it is divided between 7 countries, led by Saudi Arabia, and it contains the largest oil reserves in the world. Oil was discovered in the 20th century and has transformed the culture and economies of the region, bringing modernization but also tension over cultural changes. The US imports more oil from Saudi Arabia than any other country on the peninsula.