You can't possibly support this, though I'd love to see you try. I doubt I'll get anything of the sort though, probably another 1 sentence parroting of something you heard on any of the many idiotic 24 hour news networks, at least that's the trend.
Oh, you're right, we are a big part of the global economy: We bail out other countries via the IMF. We give financial aid to many countries who don't deserve it.
I'm quite aware that we are, you however seem to want to stubbornly ignore that fact and blather on with the mindless quips.
China owns a lot of our debt, they don't own us. In fact they are very reliant on us. The world is headed for a huge depression, China will fall with it. They have their own bubble economy, which has been hugely propped up by the US's multiple bubble economy. And China likes to manipulate many aspects of their economy. It's a worldwide phenomenon of failed economic policies and all are going down. 5 years from now it will be a completely different world.