Final answer:
In Lorraine Hansberry's 'A Raisin in the Sun,' Mama alters Walter Lee's mindset by entrusting him with the remaining insurance money, thus giving him responsibility and demonstrating her faith in him.
Step-by-step explanation:
The question refers to the play 'A Raisin in the Sun' by Lorraine Hansberry, where Mama, a pivotal character, takes an action that profoundly affects Walter Lee's mindset. Within the dynamic of this play, family struggles and personal ambitions are central themes that challenge the characters.
Specifically, in a powerful scene, Mama's action that changes Walter's perspective is when she entrusts him with the remaining insurance money, giving him a sense of responsibility and belief in his ability to make the right decisions for the family. This momentous decision demonstrates her faith in Walter despite his previous mistakes, offering an opportunity for his redemption and personal growth.