Here is a point by point of what happened in most of those countries.
Standard Oil agrees to split oil revenue with Saudi Arabia on a 50/50 basis in 1950.
Iran tells the UK that the existing 5% royalties for their oil just isn't going to cut it. They want half the money, too.
UK says fuck you to Iran. Secretly asks US for "help." Truman says no.
UK imposes sanctions against Iran--cutting off their own oil supply. The UK has to switch back to coal for electricity. The "London Fog" air pollution episode of 1952 kills 4,000 UK citizens.
UK secretly asks US for "help" and uses the word communism. Eisenhower says yes.
US CIA overthrows Iranian government. Installs puppet: The Shah in 1953 Iran gets 50% revenue anyway.
Shah is a vicious dictator for 30 years while the people of Iran learn that the CIA did the deed that took their democratically elected government from them.
Shah finally overthrown in 1979... by an Islamist Theocracy. Religion was the only speech not censored by Shah--so it was his only organized opposition. Again, Religion was the only organized opposition.
US Hostage Crisis 1979-1980.
Saudi king promotes conservative non-tolerant version of Islam as a response to Iran. Wahhabism was the family religion but now it is the national religion.
In 1979, the Russians invade Afghanistan--partly because they want to build an oil pipeline.
Saudi Wahhabist doctrine includes the idea of Jihad--and they try it out in Afghanistan.
US gives weapons to Saddam. Iran-Iraq war, 1980s.
US gives weapons to Saudi Jihadis in Afghanistan. Defeat Russians in 1989.
Saddam uses US weapons to invade Kuwait 1990. First gulf war. US installs military bases in Saudi Arabia and doesn't leave at war's end. The Islamists view the US bases as occupation. Jihad anyone?
US becomes target of Jihadis with WTC bombing of 1993.
US is still target of Jihadis in 1998. USS Cole and Kenyan embassy bombings.
911 ... and you probably know the rest.