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National Arbor Day 2021: Ways To Celebrate, Interesting Facts About Trees KEY POINTS The first National Arbor Day was celebrated on April 10, 1872 By 1920, 45 states already had their own Arbor Day celebrations Its time to celebrate an important part of our planet -- the trees. National Arbor Day is the perfect time to take a pause and appreciate the organisms that provide us with oxygen and other vital materials and serve as habitats for numerous creatures. National Arbor Day is an important h...