What is it called when you refer back to something from the past?

Questions you would be good to ask a roman gladiator? Where did Dr.. Seuss's name come from? Other than oil What resources does Iraq have that could be invalauble to Iraq and other middle east nations? List three factors that played a role in the agricultural revolution in Britain in the 1700s? What is period history? How was the spear important to the Huron tribe? How did power of the church change after the french revolution? Why did Washington end the threat of American soldiers refusing to disband? How did the great Aztec and Inca empires come to an end? How long can a 12 years children use computer? How big was the North Vietnamese army during the Vietnam War? How does the treaty of Hopewell protect Indians lands? What name is Rich the nickname for? How long is one regular term for a us representative? Why did Stonewall Jackson ride with one hand in the air? Where was Hatfield Mccoys filmed in WV? What was the result of china having a nationalist government recognized by the world but a communist party growing in the countryside? What did mussonlini do after becoming leader? What is a tomb that resembles a truncated pyramid called? How many woman did Benjamin Franklin marry?