United States does not have any defined guidelines to differentiate people in the three known classes of lower, middle and rich. But nonetheless these classes are widely used to differentiate the inequalities in the annual income and class of living. The diversity of America is based on factors such as economy, culture, ideology and politics which in turn create the factors responsible for the different classes.

No one likes to be classified in classes unless it is the upper rich class, but these classifications is necessary for governments to establish the taxes, education and healthcare the people in the lower class require. Although because of no set guidelines for these classifications, there is no way that people can classify themselves. The approach most effective is by the use of economic and cultural diversity that is used to define the middle class.

Many sociologists like William Thompson, Dennis Gilbert and Joseph Hickey have tried to create almost six different social classes. They have essentially split the three major classes into two parts. There inequalities is arisen because of a stratified society that distinguish people as lower or upper. Even though there are no sharp lines that distinguish these classes, they are universally understood and many times biased for particular sections of people. People with similar profession, similar levels of thinking, with a particular lifestyle and even people who live in an area of the city begin to be seen as a better class than the one which is visibly less fortunate. The American class system is considered very complicated which leads to generation of even more problems that keep getting worse each day. The different class systems of America are being studies by governments and different businesses to better understand their requirements and purchasing power. The middle class is the most spread class and also the most important class for any country which directly and indirectly controls the financial stability of the country.