Answer: Dr. King places his claim toward the beginning of his "I Have a Dream Speech" to set a purpose.
Explanation: Structure of a speech or a piece of writing has to do with placement of strategies, such as choosing to set the statement which contains the speech's overall purpose to be put in the opening or first part of the speech. Another way to look at structure is if you take a skeleton apart and put it back together for science class. The backbone is the part of the structure that holds the whole skeleton together. Similarly, you can take a look at a speech or piece of writing in a similar way, as if it has a structure holding it together that can be taken apart, piece by piece (sentence by sentence), moved around and analyzed.