The industrial revolution started in 1780. The steam engine was invented by James Watt. This helped to change things in industry.
The two social classes were the Bourgeoisie who were rich, they invested in technology and the proletarians who left the countryside to look for work in big cities.
Women and kids worked in very bad conditions, they had little money and worked a lot. After strikes and conflicts and help from the trade unions they started working 8 hours/day, they had vacation days, rest on Sundays and kids no longer needed to work.