Also, do you know which river the the great lakes feed into? The mississippi river which bisects the land with the most arable land on earth. The missouri river also cuts through much of the continental US. The hudson river doesn't. I've lived along the hudson river pretty much all my life, so you can take my word on this.
If you think the thames or the hudson river is anywhere comparable to the yangtze, mississippi or the missouri, I suggest you take another look at what these rivers are. The hudson barely spans a few hundred miles in length. The yangtze, missouri and mississipi span a few thousand miles deep into the hinterlands of china and the US respectively. Compared to the mississipi or the yantze or the missouri, the hudson river is a stream.