>>Economies of scale will give the USA a big advantage there. We'd have the equivalent of Walmart bulldozing its way into every market with low pricing designed to destroy competitors.
Sort of like Chinese manufacturers, you mean?
FWIW, tiny New Zealand produces top quality foodstuffs at a fraction of the cost of most trading partners and dominates international dairy trade, but is locked out of many markets by... you guessed it: tariffs, quotas and subsidies. The EU is not NZ's friend and nor is the US when it comes to NZ's food exports.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1