This is probably one of the worst stories I've ever read. It's like an edgy teen from a high school debate team said retarded nonsense and the entire universe's logic twisted just to make him right.
Of all the retarded stuff I just read, up to chapter 6 (the high-res rips are up o the goddess from danke-empire or someone), one thing stood out: rice; "Rice doesn't deplete the soil." The only energy-granting thing that doesn't deplete the soil is alcohol (biofuel), but even the stupid Brazillians can't do that right (and we funded the idiots by the way). Ignoring traditional Japan /not/ relying on rice (it is only in the latter part of the past century that rice came to literally dominate the median Jap's carbohydrate intake), it's a diverse crop. It doesn't always need paddies depending on type. But, most importantly, /all/ modern agricultures deplete the soil no matter what they do with only the following exceptions:
1. They obtain fresh soil or loam regularly from volcanos or volcanic soil. I'm talking annual rains covering you in mud up to your waist.
2. You live around a unique almost-eutrophic-but-not-quite lake, or you live near a river system like the Nile.
3. You live in the fucking Amazon, lucky you, no other tropical rainforest counts, thank the dead Indians.
4. You mix your shit back into your soil using whatever technique is appropriate (mulching, whatever), otherwise the phosphorus for example that goes from soil to grass to goat to person to excretion isn't replenished.
If we ignore the Amazonians, 99% of every civilized culture that did self-sustainable agriculture did number 4. It doesn't take a genius. In fact, your people become literally retarded if you don't do number 4 -- mineral starvation sets in and the epigenetic consequences accumulate in turn literally shrinking your cranium by an alarming amount over just a few generations (long beforehand, of course, your cows start going blind, so you get plenty of warning and have to be pretty retarded to keep the course, by which point you really are asking for it and your culture basically deserves being slaughtered by barbarians for denuding mother earth in the most retarded manner possible). Two nicely documented examples are, for one, skeletons from the hunter-gatherer period of Korea (fit, strong, smart) to the medeival-equivalent era of Korea (skulls looks like you could snap them in two), and, for another, the Pueblo Indians who kept farming the same place over and over again for 1000 years, each successive generation politely lining up their dead in order of their civilizations gradual degeneration. Early modern Europe had very few examples of doing it right, typically restricted to isolated valleys in Switzerland for example. In short, self-sufficiency clashes with defending yourself from invaders, so every expansionist culture suffered agriculturally long before the hordes of barbarians eventually wrecked them and built kickass Gothic cathedrals.
ARRRRGH this story makes me soooooo angry, it's like someone learned everything from the TV news, tried it in the real world and had a god manipulating everything in the background so they would never learn from their fuck-ups. I admit I might not be 100% right on the mark with what I just wrote, but what, does this moron author think yrace elements in a flat plain magically materialize out of thin air? That shit gets exhausted by humans who don't replenish it until Nature does so slowly over tens of thousands of years. Fuuuuuuuck it's shit like this that makes fucking retards think it's completely natural for ALL of the topsoil to disappear and only the avocado cartels soil-destroying hill-planted avocado plant can save the day by wrecking the topsoil EVEN FASTER fuuuuuuuck I'm so fucking angry....
4/10 I'm still reading it for the art.
As an aside, earlier comments mentioned cotton production on the gold coast. A tangentially related tidbit is peanut production near the Africa Sahel desert (now it IS the desert thanks to stupidity by global finance so fantastic that I think they deserve a public execution by slow crushing suffocation by sea lion). I cannot recall if this books discusses Nigerian wheat or Sahellian peanuts, but go look up "Seeds of Famine." In sort, the folks at the various global finance clubs are always wrong, but they propagandize well enough that retards vote their patrons into power perpetually, and the poor fuckers in the 3rd world "benefit," and folks like this manga's author are basically regurgitating inane propaganda, that is to say this manga is a fan-fiction of a few diamonds of truth mixed with a metric ton of economics bullshit.