Mexneck is correct. You can grow a lot of food on just a couple of acres; plus raise a hog and keep chickens. A medicinal herb garden doesn't take up much space either; add a small greenhouse, a root cellar and you're good to go. And, it doesn't take a large group of people...just 2 or 3 who are willing to get off the couch and work.
Also, it doesn't take a huge investment in shiny new farm equipment. Small acreage farmers can do just fine with 60 year old tractors and implements bought for a reasonable price on the used market.
"The time for war has not yet come, but it will come and that soon, and when it does come, my advice is to draw the sword and throw away the scabbard." Gen. T.J. Jackson, March 1861
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