The Treaty of Versailles caused long-term instability in Europe (and parts of Asia) by ignoring the nations who had lost WWI. The treaty didn't provide any support for the nations who had lost, creating resentment in the hearts' of their people. This disunity allowed for the rise of facist dictators post-WWI, eventually causing World War II.
Which battle are you referring to? In the Barbary Wars (which was the first major war to use American ships), Jefferson sent the fleet in order to stop the piracy of American ships.
Legislative, Executive, Judicial
Answer:
He's trying to inspire patroitism in his people.