The building of railroads across America contributed to commercial growth because it made commercialization possible at a high unprecedent scale.
The building of railroads contributed to the transport of merchandise and foods across America, which was fundamental for economic growth.
Moreover, these railroads also were fundamental to interconnect people and thus develop international commerce.
In conclusion, The building of railroads across America contributed to commercial growth because it made commercialization possible at a high unprecedent scale.
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