The first Arbor Day took place>Morton (photo， right) felt that>In the years following that first Arbor Day， Mortons idea spread beyond Nebraska with Kansas， Tennessee， Minnesota and Ohio all proclaiming their own Arbor Days. Today all 50 states celebrate Arbor Day although the dates may vary in keeping with the local climate. (State Arbor Days) At the federal level， in 1970， President Richard Nixon proclaimed the last Friday in April as National Arbor Day. Arbor Day is also now celebrated in other countries including Australia. Variations are celebrated as Greening Week of Japan， The New Years Days of Trees in Israel， The Tree-loving Week of Korea， The Reforestation Week of Yugoslavia， The Students Afforestation Day of Iceland and The National Festival of Tree Planting in India. Julius Sterling Morton would be proud. Sometimes one good idea can make a real difference.