Who provided the basis for the development of territorial kingdoms? How? Why does this "base" prove to be unsteady?

The exchange of foods between the new and old worlds

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Answer: tokugawa ieyasu (徳川家康, january 31, 1543 – june 1, 1616) was the founder and first shōgun of the tokugawa shogunate of japan, which effectively ruled japan from the battle of sekigahara in 1600 until the meiji restoration in 1868.

The basically got killed by the environment and white people