It has made ground in Iraq since the US invasion delivered a Shia-majority government. This has alarmed Sunni-dominated Saudi Arabia and helped fuel the Middle East’s version of the Cold War with the Saudi–Iranian relationship at its core. Saudi Arabia may be bigger than Iran, and it may be many times richer than Iran due to its well-developed oil and gas industries, but its population is much smaller (28 million Saudis as opposed to 78 million Iranians) and militarily it is not confident about its ability to take on its Persian neighbor if this cold war ever turns hot and their forces
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