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The secondary source is the evidence of someone who was not present at the time of occurrence of the event e.g., books written by historians. The secondary source is also of great historical importance to the historians. Although secondary source is itself dependent on primary sources.
The Dred Scott decision was the U.S. Supreme Court's ruling on March 6, 1857, that having lived in a free state and territory did not entitle an enslaved person, Dred Scott, to his freedom. In essence, the decision argued that, as someone's property, Scott was not a citizen and could not sue in a federal court.
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The Scientific Revolution was a major event that changed traditional beliefs in Europe. People had accepted old theories that the Sun and all the other planets revolved around the earth. Until scientists started observing nature and questioning common beliefs, citizens remained loyal to the ideas of the past.
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