What is the best declamation piece for all high school levels?What is the best declamation piece for all high school levels?
You can take this in many different ways, because there is so much from which to choose. I will talk about ancient works, because that is what I know best. Also, rhetoric and the art of declamation was in many ways developed in the ancient world.
If you go with the Greeks, you can do a part of a speech by Demosthenes, such as On the Crown, or his Philippics. This can be a lot of fun as you imagine the historical context of Athens and the rise of Philip of Macedon.
If you go with the Romans, you can do a speech by Cicero. He has written so much. So, there is a lot from which to choose.
If you go with a religious twist, you can read one of Paul's letters in the New Testament. Scholars are increasingly seeing the rhetorical elements in Paul.
If you go with a modern person, I suggest a speech by Churchill or Lincoln.
Do you have a specific genre to work with? As far as I know, declamation selections can be poetry, prose, speech, etc. If fictional prose or poetry/drama is allowed, I'd suggest the following:
From To Kill a Mockingbird: Atticus Finch's closing statements in the Tom Robinson trial
From Macbeth: Macbeth's "Tomorrow, and tomorrow, and tomorrow" soliloquoy in Act 5, Scene 6
From Romeo and Juliet: The Friar's scolding of Romeo in 3.3