Because domestic food production is critical to national security. If you let the cheapest shitholers supply the country's food then you'd be beholden to those shitholes for food. That's a bad thing.
Look at what happened to microchip production for a more recent example. We LET that production move out of the US and into ching chong wing wong land and now our chip fab capability is a joke.
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It explains the rampant faggotry in western Europe currently.