How did the discovery of large oil reserves in Saudi Arabia during the 1930's change the country and the lives?

D.The country has greatly improved its infrastructure and modernized many utilities including electricity and telephones= The grroup OPEC, (a group of arab nations with petroleum as a main resource), has brought a huge advancement in life in general. Large, magnificent cities in the Arab countries have popped out of nowhere over the last 80 years, go to google images and search Dubai to get a better idea of how powerful an oil-rich country can become. With other countries like the US in demand of petroleum, Saudi Arabia can sky rocket the prices because we need it.