First, I don't think space is either American or Non-American land :) Second, I imagine outer space treaty covers this in much similar way that treaties govern

First, I don't think space is either American or Non-American land :) Second, I imagine outer space treaty covers this in much similar way that treaties governing international waters do. Third, to a certain degree "satellite trash" is in the eye of beholder - I don't think there's any more or less legality in this, than in ISS, TV and comms satellites, GPS, etc all flying all around the world.