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It's hard to pick three.

The US river system is the Mississippi (and tributaries, including the Missouri and the Illinois and the Ohio and the Arkansas and and and). It's certainly got to be one of the three.

Now, though... it gets harder. There's the Colorado, the Columbia, the Rio Grande (slightly more than half of which is actually on the US-Mexico border), the St. Lawrence (most of which is in Canada, though for part of its course it forms the border between Canada and the US), the Hudson, the Savannah, the Susquehannah, the Connecticut, the Yukon... pick two. In terms of volume, and only counting those rivers that actually discharge into the ocean, it's the Columbia and the St. Lawrence... if you want to disqualify the St. Lawrence as being primarily a Canadian river rather than a US one, then replace it with the Yukon (also partly Canadian, but it does flow through a substantial portion of Alaska also).

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12y ago

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