Because of the Industrial Revolution and many medical, sanitary discoveries, more food production, all of which led people to live healthier and richer lives, increasing the population.
Why Did The Rate Of Population Increase In The Late 1800s?
The industrial revolution, both of them, helped family with incomes. With more food, medical, homes, and the demand for more workers created the population increase.
Because more people were produced and born! Duh!