How did 9.11 attacks impact international relations. Provide 3 arguments?

Whole books could be - and have been - written on this subject. But these impacts were, among others:

- it got the US in a war with two nations, Iraq and Afghanistan, and toppled their leadership

- it disturbed relations between the US and many of its allies, especially those who didn't support the US' policy of immediately invading these two countries. Especially relations between the US and France went to sub-zero levels for a while.

- it severely disturbed relations between Turkey, Iraq and Iran, because each population group in Iraq - Shiite muslim, Sunni muslim an Kurd - sought help from their fellows in these countries to support them in their struggle for power and/or autonomy

- even the present civil war in Syria can be seen as a continuation of the Shiite/Sunnite power struggle that began back then.

9/11 also impacted (through the US response) the relationship between Pakistan and Afghanistan and between Pakistan and the US, mainly because of the love/hate relationship that developed because of the US dependency on Pakistani logistical support, the drone attacks that are seen by Pakistan as a US infringement of Pakistani sovereignty and the almost take-over of many Pakistani districts by the Taliban.