US by far
The US Embassy hostages in Iran.
There are no US troops presently in Iran (as of May 2008)
The US backed the Shah of Iran who was an authoritarian monarch.
No, from Dubai and many other places but Iran
no.
NO.
No
At the time, Iran was a bigger threat to the US, and giving Iran another strong enemy to worry about would help US in it's machinations against Iran.
Iran doesn't get along with US and vise versa since the Iranian reveletion in 1979. Iran calls US the big Satan and US sees Iran as a threat.
Before 1979, Iran was very friendly and welcoming to the US. Iran was a very close ally of the US. After the revolution of 1979, the Iranian government declared the US a satanic nation.
It is Iran's nuclear ambitions.
Why are U.S. - Iran relations so tense