What does long ago mean?

Which Supreme Court case raised the issue of a black slave who lived in a free state and questioned whether slaves were free once they set foot upon Northern soil? Why were Timothy O'Sullivan's and Alexander Gardener's photographs of the Gettysburg battlefield so disturbing? Who did Francisco Pizarro get married to? What is Vasco da Gamas Birthday? Why is roger bacon famous? What do languages tell us about migration patterns? What were four new industries besides the automobile industry that grew importance during the 1920s? What did the map of Germany look like before World War 2? Who were the first inhabitants of the carribbean islands? Why would andrew carnegie and friedrich engels disagree about the effects of industrialization? Who won mcCulloch v. Maryland? In 1803 one of Napoleon representatives came to see and asked how much the US would pay for all of Louisiana? Which was not a result of the growth of railroads in the 1800s? The first American automobile to be produced in quantity was the? Which state sent the most delegates to the Constitutional Convention? Where is the Tonto Basin Public Library in Tonto Basin located? What are the geographical characteristics of Rhode Island? Was William Wilberforce a Freemason? Who was Wolsey? What is a transnational movement?