How does the anecdote about the Japanese ambassador contribute to the central ideas of the text??

He opens his speech with a sentence referring to “a date which will live in infamy" to grab his audience's attention.

Explanation:

The anecdote about the Japanese ambassador is important for the idea of the Day of Infamy as it points out the nature of the happenings in the Pearl Harbour. President Roosevelt refers to the diplomatic relations between Japan and the USA, as he was saying that the Japanese ambassador was communicating with the USA after the attack on Pearl Harbour was underway. The main idea of this speech is the Japanese trait of the trust of the USA.

the sentence that avoid faulty coordination is:

culture, which is well represented in philadelphia, plays a major role including theatre, music, and the visual arts.  

faulty coordination occurs when the writer gives equal importance two different ideas (clauses) which in fact are not equivalent. in order to correct a misplaced clause or idea, the writer can place less important or emphatic ideas in a relative clause as in the previous sentence.  

it u understand what he thought at the time and let u know more about him then what third person would of known probably. hope this : )