'Horse of another color' is the opposite expression from Shakespeare's 'a horse of that color' in the Twelfth Night Act 2 Scene 3 where Maria told Sir Toby Belch that her purpose was indeed a horse of that color which meant that Sir Toby Belch got the same idea as hers. So, 'horse of another color' is an idea different from the other.
Explanation:
Sophistication is the account of George Willard, and then after his experiences with multiple depressed people before the his expulsion to Winesburg, it demonstrates his frame of consciousness and emotions. A deep awareness about his own fate was bring back to George by the sudden death of an individual.
In "The American Dream", the speaker uses a rhetorical argument to persuade listeners that Americans must join together as equals. The American Dream is a national ethos of the United States, a group of ideals in which freedom includes the opportunity for prosperity and success. The American Dream appeared in the Declaration of Independence, declaring that "all men are created equal" with the right to "life, liberty and the pursuit of happiness".
It shows that there are more sources for the reader to read, and it also is strong supporting evidence for the main idea.