WD> And how do wo know that Iran shot down a drone ?

This is not in dispute by either nation, Iran has admitted that they were the
responsible party, their own General drew up a map at the time of the event
with his account of what occurred. In addition to this, video of the event has
been released by Iran that shows the missile being launched. 
This is all over the media, curious that you have not seen this on your local
media. 

WD> Perhaps the attack on the tankers was a covert operation by the CIA?

Are you going to go all out "Alex Jones" and generate fabulous conspiracy
theories. This is something that I never expected that you would do.
The mines and fragments found seem to have a Iranian origin. More information
will be forth coming about this as evidence mounts against them.  

The U.S. used to be get alot of oil from the middle east, but today the U.S. is
energy independent and are actually have a surplus.

Which begs the question why then is the U.S. there?

Answer because the mere mention of Iran playing games with laying mines and
other aggression does have an effect world markets.
The U.S. is there to ensure that the flow of oil continues to travel to its
destination without any interference from the nation of Iran.

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