jux·ta·po·si·tion
the fact of two things being seen or placed close together with contrasting effect.
Answer:
Zachary Taylor was the 12th president of the US, President George Washington started in 1789.
Explanation:
Pollution could be a focus you could write about.
Explanation:
The legal right to express one's opinions freely, is what freedom of speech is, so shouldn't be to hard. Just express how you feel about something. I know it's not a complete answer, but might help some.
The long-line structure allows for predictable rhyme schemes.