This is the plot overview .... re-read it, particularly the last paragraph. Also read the section of motifs and themes about the importance of "dreams".
Most of your other questions you have answered correctly.
I'm stuck on these in A Raisin in the Sun: Why does Mama decide not to move? In what way does she show herself to be stronger than her children?
I'm stuck, please help!
3 answers
http://www.sparknotes.com/lit/raisin/summary.html
Thanks again!=)