@tinytim : go back further.
And dont be fooled. Gulf war was over protecting oil interests. I was part of expeditionary force escorting tankers.
Regardless of the allie status, we dont tend to get involved where we dont have financial interests. After ww2, we did involve ourselves in a couple conflicts based on treaties established post ww2. But much central and south america involvement and middle east involvement isnt about saving the world from communism or dictators, but protecting our interests.
Look at the communist and dictatorial states we ignore, and those we dont and see what the determining factors are.
But, saudi has long been an allie and a financial interest -so I guess we are covered either way.