What does the arrival/inclusion of dill in the story add to the novel (influence on plot events or characters)?

In Chapter 1 of To Kill a Mockingbird, Scout is reminiscing about Jem's broken arm, an event that happens later in the story. When she considers how the chain of events surrounding his broken arm began, Scout blames the Ewells. However, Jem believes that Dill is the reason it all began. Dill gives them "the idea of making Boo Radley come out."

Dill, otherwise known as Charles Baker Harris, stays with his Aunt Rachel in Maycomb County during the summer. Once Dill "had been studied and found acceptable," he and the Finch children spend a great deal of time together. According to Scout, "The Radley place fascinated Dill." It is in this way that Dill contributes to the plot development. Before Dill, Scout and Jem are aware of the rumors and superstitions regarding Boo Radley, but Dill is the one that dares Jem to touch the house. After Jem completes the dare, Scout recalls seeing a shutter move in the house. Just as the children are interested in Boo, he becomes interested in them as well.

Explanation:

1. read the following excerpt from franklin d. roosevelt's "fireside chat 19":

on the other side of the picture, we must learn also to know that guerilla warfare against the germans in, let us say serbia or norway, us; that a successful russian offensive against the germans us; and that british successes on land or sea in any part of the world strengthen our hands.

remember always that germany and italy, regardless of any formal declaration of war, consider themselves at war with the united states at this moment just as much as they consider themselves at war with britain or russia. and germany puts all the other republics of the americas into the same category of enemies. the people of our sister republics of this hemisphere can be honored by that fact.  

the true goal we seek is far above and beyond the ugly field of battle. when we resort to force, as now we must, we are determined that this force shall be directed toward ultimate good as well as against immediate evil. we americans are not destroyers — we are builders.

analyze the effectiveness of this excerpt. how does it function within the speech as a whole? how does the structure of the excerpt to convey the speech's purpose and key points? support your argument with evidence from the speech. (10 points)