Which natural resources became more available to the American public of a railroad expansion?

The expansion of railroads in the United States significantly increased access to Natural Resources such as coal, timber, and metals like iron and copper. This enhanced transportation network facilitated the movement of these resources from remote areas to urban centers and markets. Additionally, agricultural products from the Midwest could be shipped more efficiently, contributing to the growth of the economy and the availability of goods to the American public. Overall, railroad expansion played a crucial role in linking resource-rich regions with consumers and industries nationwide.