Man...I trusted you...Man, i put my life in your hands...Man...That molney is made out of my father's flesh.
I'm sorry, Walter...I had my life stacked on this deal, too...
Son-Son...Is it gone? Son, I gave you sixty-five hundred dollars. Is it gone? All of it? Beneatha's too?
Walter is disappointment to his family for not trusting him to take care of the money in the house. He wanted to open up his own bar so that he could achieve his dream, but Mama invested it for Benathas education. Walter feels like he doesn't have a voice in the house and that all of the discussions are based on Mama.
One of the internal conflict of Beneatha is that she hasn't found her identity and so she is trying on different way to express herself. One of the way she does is that Asagai gifts her an African clothing which gives her an opppurtunity to study African culture.
This is an illustration of an external conflict between Walter and the family. Mama finally trusted Walter to be in charge of the house and take care of the money. But Walter being impatient and determined, used all of that money (and Bobos) to get a liquor license to open up his own bar. Bobo and Walter got scammed and no one knows what to do.