When did Aikido begin?

1931: first dojo is opened by Morehei Ueshiba (O-Sensei) Aiki-budo is taught. 1942-1952: Aikido is formally used and techniques are perfected. 1948: Aikikai Association is founded to promote Aikido. 1950-1970: Aikido is spread throughout the world. http://www.aikikaicuracao.com/aikicurbiographyosensei.htm