How does Lorraine Hansberry use contrast in A Raisin in the Sun to explore the Younger family's struggles and aspirations?

Lorraine Hansberry effectively uses contrast in A Raisin in the Sun to highlight the struggles and aspirations of the Younger family. She contrasts their dreams of upward mobility and personal fulfillment with the harsh realities of poverty, racial discrimination, and limited opportunities in 1950s America. For example, Walter's entrepreneurial dreams of owning a liquor store contrast sharply with his menial job as a chauffeur. Additionally, Hansberry contrasts the generational values within the family, such as Mama's traditional faith and desire for a home with Walter's materialistic ambitions and Beneatha's intellectual and pan-Africanist pursuits. These contrasts underscore the internal and external conflicts faced by the characters, making their eventual triumph of dignity and family unity more poignant.