The use of coal-fired steam engines allowed the expansion of?

The use of coal-fired steam engines facilitated the expansion of industries by providing a reliable and powerful source of energy, which was crucial during the Industrial Revolution. This technology enabled factories to operate machinery more efficiently and on a larger scale, leading to increased production and economic growth. Additionally, steam engines revolutionized transportation, powering locomotives and ships, which improved the movement of goods and people, further driving industrial expansion and urbanization.