VOA慢速英语:James K. Polk: Dark Horse

convention - n. a large meeting of people who come to a place for usually several days to talk about their shared work

strict - adj. carefully obeying the rules or principles of a religion or a particular way of life

plantation - n. a large area of land especially in a hot part of the world where crops (such as cotton) are grown

manifest destiny - n. a future event that is sure to happen; a destiny that can be clearly seen and that cannot be changed

bet - n. a choice made by thinking about what will probably happen

parallel - n. any one of the imaginary circles on the surface of the Earth that are parallel to the equator and that are shown as lines on maps

expensive - adj. costing a lot of money

ill - adj. not well or healthy