The state of the union address and the louisiana purchase are both examples of how the meaning of the constitution has been influenced by

The correct answer here is probably that 'The State of the Union address and the Louisiana Purchase are both examples of how the meaning of the Constitution has been influenced by America's Manifest Destiny'. Manifest Destiny refers to the idea that the United States needed to spread across the entire continent, as the Louisiana purchase was a step towards making this a reality.