What speech are you referring to?
Whigs opposed the war because many of them thought that going to war with mexico would encourage slavery expansion and allow the US to gain new southwest territories
One of the goals in writing the prince was to win the favor of Lorenzo de Medici
The Oregon Trail was part of the idea of Manifest Dynasty because, Manifest Dynasty was the idea that America should expand into the Western Territory. The Oregon Trail is people who are traveling from the East to the West, so it demonstrates Manifest Dynasty very strongly.
