The US was capitalistic from the begining and unlike the nomadic ME countries was wealthy before oil.
If oil had not been discovered in the ME would the UAE have become a "capitalistic" country?? I highly doubt it as they had not embraced capitalism up to that point.
So, if the UAE got oil money, don't you think the US got money from generous natural resources, too, especially lots of land, in the beginning? Capitalism is not about hard work, it is about investing money to make a profit. That is why it is called capitalism instead of laborism.