What are the main ways in which groups of people draw distinctions between themselves and other groups of people?

There are many different ways in which groups of people draw distinctions between themselves and other groups of people. Throughout my essay I am going to look at the factors that allow these distinctions to be made and how they are made. The general term used to describe the way in which groups of people draw distinctions between themselves and other groups of people is called 'social stratification'. "Sociologists use the concept social stratification to …

…strength. After the agricultural revolution distinctions between those who yielded land, and those who didn't existed. A type of class system was developed then and after the industrial revolution, it was strengthened. Nowadays there are distinctions made between those who are rich and poor, those who have education and those who don't, people of different races, religions and social backgrounds. All of these groups can be classified into different strata's under the title social stratification.