What is the opposite of didn't happen?

Why do we need to learn about the civil war? What is so special about us nickels minted before 1972? What impact did the three general factors that affect rural settlement have on the long lot? What kind of celebrations did the yurok have? How much does a postage stamp cost in 1967? What were the three most important crops grown in early Oklahoma? Are blackfoot penguins going extinct? What is the value of an 1806 US quarter? What was the Union Anthem during the civil war period? Why did alex Haley write roots? Does Ulysses S. Grant have a nickname? What is 1899 liberty dollar worth? How long did the colonial times last? What is Abraham Lincoln address? What were the natural resources and economic conditions that encouraged southern planters in America to develop a slave economy before the civil war? Who was vice president in 1910? What party wanted graduated income tax eight hour work days and direct election of US senators? How much is a 1979 liberty dollar? How long has George Washington Carver middle school been open? What year did Alabama secede from the union and join the confederacy?