It was developed in Japan,
There are different forms of Aikido, and rules and techniques are different for each. This is a difficult question to answer for even a single form as this could take a small book to answer.
Seagal began his adult life as an aikido instructor in Japan, and is currently a 7th dan in aikido. He is considered the first foreigner to ever own and operate an aikido dojo in Japan. Let me remind you that past 6th dan, you do not get another dan by studing the art. The 7th dan and forth, is presented to the person by it's contribution to the art. Seagal gave a contribution to Aikido and some masters to the art had not reach the 7th dan.
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
Kung Fu is Chinese, a lot of people mistake it for being Japanese because Japan once colonized China.
Actually Segal is a 7th degree black belt or dan in Tenshin Aikido, affiliated with Aikikai of Osaka Japan, He mixes it with American Kempo as seen example his first and best film Above the Law and with the best kempo in Glimmerman and Under Siege.
There are many martial arts that originated in Japan. Judo, Aikido, JuJitsu, Sumo and Iaido are some of them. Karate originated in Okinawa, which is now considered a part of Japan.
That depends upon why you want to study Aikido. In theory, all styles of Aikido should operate from the same set of basic principles. There are just different ways to study those principles and determine which principles to place emphasis on. Your best bet is to visit several schools and find the one that YOU are most comfortable with.
Judo would be closely related to Aikido.
No. Korea does have a similar martial art, but Aikido is Japanese.
Aikido Buyukan and Aikido Ryugikan are two different dojos practicing Yoshinkan aikido in the Durham region of Southern Ontario. As of right now, only Aikido Ryugikan remains open and is run by Graham Stewart Sensei, a Honbu trained Godan, (5th degree black belt.)
Hiroshi Kato - Aikido - was born in 1935.