As far as I know, the Industrial Revolution started with coal mining. As shafts got deeper there was a need to pump in water and air, and then to lift product out. These steam engines at the site could run on low quality coal allowing all of the good stuff to be sold. The Industrial Revolution really started with these mines in the UK.
As regards slavery and other factors, once the steam engines were invented and began making the companies who owned them more productive, human labor was outcompeted. Slave labor is not free as humans are quite expensive in food, water, shelter, medical care, and support for these things. Humans also require rest, and restrooms. Given that humans prefer not be enslaved, there’s also a cost to capture. Once an economic replacement for slavery and/or indentured servitude is available, these practices tend to disappear. Even animal labor usually disappears when machines are available, as animals require the same basic care that machines do not. In the USA, slavery hung around longer than it did in Europe largely due to reward for the capture of runaways provided by government, as well as a late start to industrialization.
As regards slavery and other factors, once the steam engines were invented and began making the companies who owned them more productive, human labor was outcompeted. Slave labor is not free as humans are quite expensive in food, water, shelter, medical care, and support for these things. Humans also require rest, and restrooms. Given that humans prefer not be enslaved, there’s also a cost to capture. Once an economic replacement for slavery and/or indentured servitude is available, these practices tend to disappear. Even animal labor usually disappears when machines are available, as animals require the same basic care that machines do not. In the USA, slavery hung around longer than it did in Europe largely due to reward for the capture of runaways provided by government, as well as a late start to industrialization.