The world's first known pottery was developed by the Jomon people in the 14th millennium BC. The name, "Jomon" (¿IÎÄ J¨mon), which means "cord-impressed pattern", comes from the characteristic markings found on the pottery.
The Jomon people were Mesolithic hunter-gatherers, though at least one middle to late Jomon site ca. 1200-1000 BC had a primitive rice-growing agriculture (ÄÏœÏÊÖ Minami misote site). They relied primarily on fish for protein. It is believed that the Jomon had very likely migrated from North Asia or Central Asia and became the Ainu of today.
Research suggests that the Ainu retain a certain degree of uniqueness in their genetic make-up, while having some affinities with different regional populations in Japan as well as the Nivkhs of the Russian Far East.(Tajima 2004)
Based on more than a dozen genetic markers on a variety of chromosomes and from archaeological data showing habitation of the Japanese Archipelago dating back 30,000 years, it is argued that the Jomon actually came from Northeastern Asia and settled on the islands far earlier than some have proposed.
Interesting. I would not be surprised if some American Indians came from Jomon. I remember hearing Ainu came from North Asia and now Southeast Asia. I don't think Jomon is from North Asia. I am inclined to say Southeast Asia. Ainus for one have a cult of snake, which would suggest they are from a warmer part of the world. Snakes don't live in that area. Also, many of Ainu housings look similar to Polynesians and Sumerians/Marsh Arabs (M'adans).