What do you think created the terror threat in our world?

I agree with 1 and 2. I don't know about 3. But, terrorism has been around for centuries. But, the "Big" attack on the US, hence terrorism arrived in the west and therefore began was in 2001. There had been thousands of terrorist attacks before and even some against or within US. But the media and therefore society caught on in 2001 that terrorism existed.