The speaker's tone in "Harlem" is best described as frustrated.
The poem's imagery helps to convey this tone. In discussing a deferred dream, Hughes describes a dried up raisin in the sun; a festering sore; stinking, rotting meat; and a sagging, heavy load. At the end of the poem, he wonders if the deferred dream just explodes.
This imagery helps provide the key to understanding the speaker's attitude, or tone, about his subject, the deferred dream. He is frustrated that these dreams are wasted.
Nine million, eight hundred thousand and one hundred
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I think the cane represents C. HIS SELF-CONSCIOUS DISPLAYS OF AUTHORITY.
Notice that when people using canes are in public, people around them make it a point to make sure that they get out of the way to ensure that the person using a cane will not be hindered. People are more quick to react or help if they find that the person in need is using a cane or is in a wheelchair.
Majority of people using canes are those who are elderly, thus gaining immediate respect and subservience from others.
A short story's setting is made of time and place.
Apart from plot (what is going on) and characters (who is doing what they are doing), the setting (where and when is the plot happening) is the most important element of a short story. The interpretation of a short story depends very much on how the author has described the setting. It provides a context for the events.