Because most of the world has flourished under Pax Americana. The world can only imagine what the Chinese as a world power will bring.
The middle east didn't see the same benefit, and why? Because they sat in the middle of a cold war zone of contention that stoked every existing bit of strife into a hot war.
In fact I had this very discussion with a group of Africans recently. Yeah, they weren't shy about "educating" me. Some of what they believe is, in my view, not fact based. (At least, it can't be proven in court so to speak.) But, yeah, a lot of what they were saying was definitely true.
I wouldn't mind hearing what some of those things are.