What is the reason for US presence in SW Asia?

The U.S. government identified bin Laden as the most likely suspect responsible

Explanation:

That's really all i know no shade...

Afghanistan forms the centerpiece of US strategy in Southwest Asia because American troops are engaged in fighting the Taliban insurgency

Explanation:

Civil Law, It deals with the disputes between individuals. The case filed by private party. The decision can be found liable or not liable, the judge decides this. Criminal Law, It is the body of law, that deals with the crime and the leagal punishment. Case filed by the Government. Defendant is convicted if guilty and acquitted if not guilty, the jury decide this.