How did the colonial leaders stop the people from joining together to fight against them?

The factors that led to industrilzation is with new inventions such as machines were invented. With machine, industrialzation starts to bloom in the North. With machinery work was done much more quiker and much more efficiently. However, with industrialzation machines couldnt run themselves so they n be eded people to help run them. From there child labor starts o develop. In which this is a dangerous cause to the future generations.