Industrial Revolution and Growth of Cities- The Industrial Revolution was the result of inventions that led to the use of equipment for change and allowed people to organize the work. The growth of cities changed the way people made a living, forced farmers to move to cities, causing several problems that people faced. 11. Karl Marx- Karl Marx proposed conflict theory as well as dialectical materialism and alienation. Alienation is where the proletariat gives up its labor to the market.12. Charles Darwin and Herbert Spencer-Charles Darwin wrote the book "The Origin of Species" which culminated in the theory of evolution. He also created the theory of Social Darwinism. Herbert Spencer was considered the father of classical evolutionists. Herbert was also a continuer of Auguste Comte's evolutionary approach. 13. Emile Durkheim- Durkheim was the creator of the suicide theory. This theory has four forms: egoistic, aluturistic, anomic and fatalistic. This theory has led to the understanding of suicide and how we can prevent such actions.14. Max Weber-Max produced many theories; However, some of his main theories include bureaucracy, traditional, charismatic authority, and legal-rational authority. All of these theories have contributed to how we as a society understand and study them