9/11 and Iraq: Bush or foreign oil dependency?

Foreign oil dependency, Iraq and Bush

Today, there is an article on CNN's Political Ticker, The Donald: Time for Bush to go into hiding.
In the article, Donald Trump reiterates his belief that George W. Bush is probably the worst President ever - a sentiment which seems intrinsically linked to the War in Iraq.

Yet, would the War in Iraq have happened if not for America's foreign oil dependency? Would 9/11 have happened?

How responsible is Bush for America's foreign oil dependency? How responsible are other politicians? How responsible are the people of America?

Finish: Foreign oil dependency? Is Bush the worst President ever?