Rhetorical devices – examples more specific to speeches http://www.speaklikeapro.co.uk/Rhetorical_devices.htm
John F. Kennedy’s Inauguration address in 1961. The “ask not what your country can do for you, but what you can do for country” speech
Churchill’s “Iron Curtain” and “Sinews of Peace” speech
Barack Obama’s Recent Speech to the UN, regarding Russia’s invasion of Crimea.