Passage:
In the early twentieth century, urban historians widely attributed the rapid industrial expansion of the American Rust Belt exclusively to the proximity of coal deposits and iron ore shipping lanes along the Great Lakes. However, recent historical analyses by scholars such as Elena Rostova challenge this single-factor explanation by demonstrating that municipal infrastructure investments—specifically, public sanitation systems and standardized rail gauge integration—were equally critical in sustaining urban manufacturing hubs. Rostova argues that while natural resource access facilitated initial factory placement, it was the civic regulation of water quality and city-managed freight interchanges that prevented severe labor shortages caused by waterborne epidemics and reduced transit friction between competing rail lines. Nevertheless, Rostova's critics contend that her framework overestimates municipal agency, pointing out that several midwestern cities with sophisticated sanitation networks failed to industrialize due to high regional freight tariffs and a lack of local venture capital. Consequently, contemporary consensus holds that industrial growth depended on a complex convergence of geographic endowment, civic infrastructure, and macroeconomic financial conditions.
Statement: Based on the passage, Elena Rostova's research identifies high regional freight tariffs as one of the municipal infrastructure factors that directly sustained urban manufacturing hubs.
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