driving force behind population increases

The main driving force behind population increases is a combination of factors including fertility rates, immigration, and mortality rates. High fertility rates and low mortality rates, combined with increased immigration, can lead to a rapid increase in population. High fertility means that more people are being born, while low mortality means more people are surviving to reach an age of reproduction. Immigration, meanwhile, allows new people to move into an area and contribute to population growth. In recent decades, the availability and effectiveness of various forms of contraception, such as birth control pills, have also impacted population growth by providing people with the ability to better control their fertility.