Which event marked the start of significant changes in society during the Industrial Revolution?

The introduction of steam power marked a pivotal transformation during the Industrial Revolution due to its profound impact on manufacturing and transportation. Steam power enabled machines to operate more efficiently and at greater scales than manual labor or earlier power sources such as water and wind. The advent of steam engines allowed factories to be built away from rivers, resulting in the growth of industrial centers in urban areas. This innovation also revolutionized transportation with steam-powered locomotives and ships, facilitating the faster movement of goods and people. This efficiency not only boosted productivity but also led to significant changes in workforce dynamics, urbanization, and economic practices, establishing the foundation for modern industrial society. These shifts in technology, social structures, and economic interactions characterized the essence of the Industrial Revolution.