Final answer:
William Levitt is referring to the housing shortage after WWII. He addressed it through mass-produced, affordable homes in suburbs like Levittown but also contributed to racial segregation with exclusionary policies.
Step-by-step explanation:
William Levitt, an influential real-estate developer, is known for his role in addressing the housing shortage that arose after World War II. Levitt is referring specifically to a scarcity of homes caused by the lack of residential construction during the war and the subsequent boom in demand when soldiers returned home. Through mass-production techniques, Levitt created entire neighborhoods of affordable housing, such as Levittown, helping to ameliorate this problem. However, his developments were also criticized for promoting racial segregation, as Levitt would not sell or rent to African American families, maintaining homogeneity in his communities.