How dos twain give us sense of place?

This excerpt from mrs. dalloway reveals the state of mind of septimus warren smith, a war veteran with a outlook on the world. the last two sentences also illustrate , which is a common characteristic of modernist literature.

Charles darwin time connective and dates

In paragraph 5, president obama remarks: “you know, when trayvon martin was first shot i said that this could have been my son. another way of saying that is trayvon martin could have been me 35 years ago.” how does president obama use rhetoric in this quote to contribute to the overall meaning of his speech?