This document provides a literature review and introduction to a paper examining the origins and continuance of income inequality in the United States. It discusses how income inequality has increased dramatically in recent decades according to studies. It then explores some of the sociological factors that have contributed to rising inequality, such as changes in family structure, education levels, race, and crime/incarceration rates. The document provides historical context on these issues and their impact on inequality over time. It aims to analyze the problem of inequality through sociological, economic, and political lenses over the 20th century in the US.