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"Over the last 150 years, the proportion of Americans employed in agriculture has dropped from ~70% to ~2% [1]. They've literally been replaced by machines."

In most of the fields I've seen they've been replaced by Mexicans.

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Then fine, it's probably 5% if you count them in. It doesn't change the fact that all the machines we now have, combined with the fertilizer revolution of the early XX century that started with the Haber process[0], has increased the food production output per worker by orders of magnitude.

[0] - https://en.wikipedia.org/wiki/Haber_process

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