Show me the figures. The US has 90 million cattle, 60 million hogs, more than a billion poultry, 75 million acres of beans 35% of which is exported! and 90 million acres of corn with record yields. We are 5% of the worlds population but are responsible for 15% of the global food supply. Is there a country that produces more food? Obesity is the #1 health issue and we didn’t get that way eating air sandwiches.
You are right that there is no evidence that native is necessarily better. How many of the vascular plants you mentioned are food sources? 1000s of native plants are poisonous because they have been at war with herbivores for eons.
I've done it at least a half dozen times with smarter posters than you, the last of which was in 2006.
You are right that there is no evidence that native is necessarily better.
That's because "native" has been displaced by introduced species. Native plant systems made those fantastic soils farmers are mining. There were processes in place that sequestered atmospheric deposition of trace minerals the mechanics of which are now lost because the farmers at that time had no understanding of how those systems worked. There are bacterial symbiotes within that system that are host-specific not just by species but by localized strain. So to say that it was something less productive simply because we have changed things so much that we don't even have an example of a native system is simply would be just as false as for me to say that they are intrinsically superior.
You don't know what you're talking about.