One of the terms was Fugitive Slave
Probable answer: Modern science (the Scientific Revolution)
The Scientific Revolution (16th-17th centuries) questioned superstition and traditional beliefs that had not been investigated. The Enlightenment (18th century) further championed this approach to knowledge, emphasizing the use of reason in all matters, in contrast to following superstition or unquestioningly accepting traditional beliefs.
The Scientific Revolution showed that there are natural laws in place in the physical world and in the universe at large. Applying similar principles to matters like government and society, Enlightenment thinkers believed that using reason will guide us to the best ways to operate politically so we can create the most beneficial conditions for society. For many Enlightenment thinkers, this included a conviction that all human beings have certain natural rights which are to be protected and preserved. This led to changes of approach to how society should be governed -- moving away from ideas like the "divine right of kings" to the establishment of more democratic, constitutional societies.
The Americans called the War of 1812 the "Second War for Independence", because the War of 1812 was against the British (which was their previous rulers). 1812 was when the British once again tried to take back the Colonies.
The US won once again, and it was known of the "SWfI" because it was against Britian (which was the strongest nation during that time
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People's life expectancy increasing resulted from of improvements in sanitation, vaccines and antibiotics, housing, and education, causing people to reach a later age than before; Previous eras did not have the equipment to survive infections and diseases.