In the United States, I thought it was interesting that the Missouri River (which starts in Three Forks, Montana) was chosen as that river. I assume the choice was because this is the longest river, but maybe not quite as well known as the Mississippi river perhaps. And I would guess that not everyone knows the Missouri starts in Montana.
When you let go of the grab, other rivers are redrawn. For the US, that includes the major river systems (including the other major contributors to the Mississippi), which makes sense.
Interesting visualization is all.
If the opposite decision had been made, the river would be even longer in the books.