That's why you're theoretically better off using entry guards and exit nodes in the US if you are in the US, and assuming they do more surveillance at the borders, although they are likely tapping IXPs inside the US too. Unfortunately, the internet is not a spider web with multiple links between destinations. Most traffic congregates at choke points like IXPs and backbone fiber, making it relatively easy to snoop on a lot of it, just as everyone traveling long distance is likely to drive on an interstate.