Originally Posted by dannywpt
To put it as simple as possible: When growing up as kids, all the way from kindergarden to college, Europeans play soccer. Americans play basketball.
In addition to this, the obvious genetic differences aren't exactly working in the Europeans favor either. Combined, this makes USA the vastly superior side.
No european player comes close to a guy like Bird and that ain't certainly due to athleticism, so what you mention first also plays a huge part.