Thete are folks making money researching food soveriegnty. Here, "NCAT explores whether a regionally based agroecological food system can achieve food sovereignty."
https://attra.ncat.org/feeding-the-world-part-2-a-tale-of-two-worlds/.
I will tell you this is a half truth; food sovereignty begins in our own garden, growing what our climate and environment permit. As noted in the New York Assembly Journal, 44th session, p.842 (1820-1821): "Agricultural products especially, if remote for market, will net but very little; and these appropriations necessarily increase the taxes upon the agriculturalist, whose crops when raised will hardly be for sufficient to pay them."
Agriculture is logistics, so the short answer to NCAT's hypothesis is "yes", regionally based food systems aid in food sovereignty, but that does not tell the whole story of the logistical requirement. Nearly all current research assumes that we as a society will have a heavy reliance on commercial production regardless of geographical location. Gardens negate that requirement to a great extent, and historically are documented to have been solely sufficient before our reliance on commercial agriculture within this country. The last time I can find any record of our government promoting self-sufficiency and growing what we ourselves can consume at the family level, was immediately following the agricultural depression of the 1890s. This actually led to the development of the phrase 'agricultural economics', which was previously incorporated within the specialty of 'rural economics'.