Actually, Karate (or Karate-Do) originated in Okinawa from Chinese Kung Fu. In 1609, the Japanese invaded and conquered the Okinawans. The Okinawans had held a favorable relationship with the Chinese since the 11th century and had integrated both their Zen Budism and (in a rough form) their Shaolin boxing systems. It wasn't until the 17th century that Okinawa started to really develop it's own distinct system of fighting. During the Japanese occupation, Okinawans were allowed to travel to China and vice versa. This free travel and trade allowed both Okinawan martial arts practitioners to travel to China and Chinese practitioners to travel to Okinawa. By 1629, the Okinawan "Tode" (thier original fighting method) and Chinese Boxing had combined to form simply "Te" or "hand". This new "Te" was different from it's Chinese cousin in that it focused on techniques that were effective, easy to learn, and imediately combat ready. Things such as animal styles (for the most part), the more internal arts, and techniques that were not practical for self-defense were discarded or simplified. Also during this time, "Kobudo" or armed combat was developed using farming tools as weapons. Eventually, "Te" was divided into 3 distict schools of thought: Shuri-Te (external, hard, offensive), Naha-Te (internal, soft, defensive), and Tomari-Te (a combination of both). It wasn't until later that the Japanese introduced styles such as Kendo and Judo to the Okinawans, however, their impact on Te was not all that great. Then, finally, in 1922, "Te" (or known by this time as Kara-Te) was brought to Japan by a Shuri-Te stylist known as Gichin Funakoshi (who is known as the father of Shotokan).
Sorry for the history lesson, but Karate is one of my passions.
Rock On!