Did Iraq have anything to do with September 11 terrorist attacks?

Yes.

Here's one connection. I hear, in the news, that Osama Bin Laden was mad at USA, in part, because our troops were occupying holy land in Saudi Arabia during 1990 - 1991 Gulf War period. It was Desert Shield followed by Desert Storm. Apparently this situation is one of the things to cause Bin Laden and followers to turn against US with a vengeance.

Why were our troops there?

There's a connection. We were in Saudi Arabia trying to deal with a problem related to Iraq.

We're always trying to "fix" the Middle East. Maybe we would have been better off learning to live without Persian Gulf oil. Or at least we would have been less likely to piss people off.

Of course, some folks are always pissed off, but we can try to stay out of it. Let the pissed off people quarrel amongst one another.

Unfortunately we're a bit pissed off also. We're a bit spoiled by cheap energy.