So, to visualize my armchair imagineering of reconfiguring the lands. Here's what it is now:
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Yes, MK maps put Diamond Horseshoe in Liberty Square. And if it's suppose to be set in St. Louis, then it's not Wild West. St. Louis was pretty metropolitan by the early 1800s. Also Haunted Mansion is Gothic upstate NY, not Colonial. And there's a Riverboat in Colonial Philadelphia.
And Country Bears are deep south singing mid-20th century songs, not Wild West. And Splash Mountain is supposed to be Deep South as per the source material, but a veneer of Western decoration was fused onto it to make it fit.
So, what if the Rivers of America really was a tour of the rivers of America (like Jungle Cruise jumps around to the big jungle rivers of the world) -- which is what they do in Disneyland. Then you can match the attraction to the river as thus...
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So, Haunted Mansion is there because the river next to it is the Hudson River. The Liberty Square port is on the Delaware at Philadelphia. Then we jump to St. Louis and head down the Mississippi. Diamond Horseshoe can lose its thinly veiled Wild West facade and be a more urbane crossroads of the mid-1800s, thematically supporting what is on the other side of the river: Tom Sawyer's Island.
Heading South on the M., we meet the Country Bears. Then when we get to the New Orleans delta, there's Tiana's Restaurant (formerly Pecos Bill) and Tiana's Bayou Adventure. Just beyond New Orleans Square is the Caribbean Gulf where there are Caribbean restaurants (Tortuga) and Pirates.
Continuing on the river, we jump to the Colorado River and see the BTMR. And then we jump to other big rivers of The West such as the Missouri, Yellowstone, Snake, and Columbia and see the Indian Nations along the way.