Why do Europe and USA send e-waste to the China?

Now everyone have a computer or laptop, we use them very often, and they  break very often also, if it can't fix, where will you put them, throw it away? recycle It? no matter what you do, most of those things will not be recycle, in fact. They will travel to other countries like China and Africa but why?

The answer is no one want it because they are garbage, but only poor countries like china and Africa no police and army is in charge in their, so people in USA can ship the e- wastes there and leave it there, no one will see them.

This seem like is just throwing garbage in other people's place. But there are some serious problem inside. The pollution problem. In things like computer have a lot of thing is poisoness 

these thing go in to the river the food that in china, and it will affect the hole world.

China's government should have more police and army in charge of this thing. And the government should have some FBI in charge of this to, watching people don't ship the garbage out to other country