[ska]

US produces about 1/3 of worldwide soy, I think production is only second to corn. So if nothing else, it's available.

[rileyphone]

IIRC soybeans help add nitrogen back to the soil and are highly subsidized.

[michaelcampbell]

According to https://www.ilsoyadvisor.com/on-farm/ilsoyadvisor/nitrogen-s..., they "fix" nitrogen so require less than other crops, but it's still a net negative.