One of the main themes is the American Dream. The Younger family, like many African - American families at that time, is striving for a better life which is part of the American Dream concept. Another theme is racism. They face discrimination in housing and in society in general, which shapes their experiences and decisions.
I think identity is also a theme. The characters are constantly defining themselves in the context of being African - American in a society that doesn't always accept them fully. Their dreams and the way they pursue them are also part of how they form their identities.
The theme of family is very prominent. The family members in 'A Raisin in the Sun' have different dreams and goals, but they are still bound together. Their interactions, conflicts, and support for one another show the importance of family in the face of difficulties. Also, there is the theme of hope. Despite all the hardships, they still hold on to the hope of a better future.