The economic case is narrower than the naval one: the canal is most useful for particular routes, especially Europe to the US west coast. Without the canal, American rail transport would likely carry more east-west trade. The older clipper race demonstrates how valuable the Europe-Asia route already was before Suez shortened it, reinforcing the canal's unusually strong commercial logic. Without that proven return, Panama would look more like a strategic bill Congress must fund than an investment expected to repay itself. The counterfactual allows no single firm outcome because preventing either canal requires changes with consequences beyond shipping.
Notable Point · 53:00-55:54
Panama's trade loss reinforces US railways
Without Panama, much Europe-to-West-Coast trade would likely land on the eastern seaboard and continue across North America by rail.