Arbor Day began in the United States in 1872 in Nebraska. J. Sterling Morton, a newspaperman, knew how important trees were to the land so he began the idea. The state offered prizes to the groups and people who planted the most trees. On that first Arbor Day, the people of Nebraska planted more than one million trees.
For a long time, Arbor Day was celebrated on April 22nd, the same day as Morton's birthday but now most of us celebrate it on the last Friday of the month of April.