On a related tangent, apparently modern karate originated in Okinawa, where it was locally called something like Tang-style (of the Chinese Tang dynasty). But it was re-branded Karate to make it more palpable to Japan (since they happened to be in the middle of invading China).
it's well documented actually, before 1900 or so no one in mainland Japan knew anything about what would later be called karate.
Gichin Funakoshi (father of shotokan karate, even though he never called it that himself) moved to mainland Japan in 1922 to popularize it. Before then only a few people in the Japanese navy and the prince/emperor-to-be had seen it while visiting Okinawa.
Yes, there are other styles other than Funakoshi but he is undisputably the one who broke into mainland Japan first
Having lived in both mainland and Okinawa, the cultures are rather starkly different as well - Okinawa with a pretty typical, more laid back island culture and mainland with a bustling, busy one. In this regard, Japan isn't as homogeneous - both culturally and genetically - as the article would have you believe if the covered area were to include Japan's southernmost islands.