Of the total area that is used by humans (Agriculture, Urban and Built-up Land),
- urban and built-up land is 1m km²,
- agriculture is 48m km²,
so agriculture is 48 of 49 millions km² used, that’s 98%. The remaining 2% are all streets and housing and other infrastructure together.


During peacetime, all the corn fields kept operational with subsidy that just create corn which is fed to livestock seem like a waste.
But if China (or anybody else) pulls a fucky-wucky and makes it difficult to get food imported from outside the US, we slaughter the livestock and then have enough corn to feed the whole nation (and a lot of our allies). Without missing a beat.
Allies? Lol.