Maybe because very few people live there? If so few people are really affected, how can your whole economy suffer so much?
Few people in areas between highly populated ones, but you need someway to get goods and people between one highly populated area to another. This requires going through sparsely populated areas.. which makes trains unfeasible and cars/trucks necessary. After all, making train stops in towns full of 100 people ain't going to make you much money, but driving down the parkway and stopping for food/gas/rest is totally economically feasible as things exist in the US.
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