Trivia Card 4 is a item in Mother 3 that can be received in New Pork City by the man in the front of the King Statue after you defeat it. It can be used in a battle against a human enemy, such as a Pigmask, to ask them its question.  The correct answer to Trivia Card 4 is the Civil War. There is a likelihood that the question was "What great event took place in the 1800s" since half of the answers took place in the 1800s. Civil War took place 1861–1865,The Industrial Revolution took place in 1750-1850, and the Battle of the Alamo took place in February 23 – March 6, 1836.