The similarity between all these items is the girl, the protagonist of the poem, removed them from something or someone. None of the items belonged entirely to her. The difference between these items are the purposes that made this girl want them and the time of life when she got them.
Greed is selfish and negative. This can be confirmed with the tone of the poem that judges and disapproves of the girl's actions, which, due to her greed ends up accumulating things that are not worthwhile for her, but that would make someone else happy.
Struggle, grief, and despair are the main emotions of this time period due to the Civil Rights Act. When MLK spoke of their struggles, that is what sparks the most emotional response and connotation.
