Entirely by design.
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The US isn't self sufficient in food. Food imports are going to get more expensive.
The world doesn't need that much guns and missiles. There are two major markets currently and that's all mostly.
You may be tempted to assume that only active participants in wars buy weapons, but that has never been the case. And especially now, you have many countries trying to restock and prepare.
Countries may be unwilling to trade with an increasingly belligerent US that slaps everyone with tariffs. In fact, many will just slap the US with tariffs and other barriers of their own.
No major US export sector operates exclusively as an exporter without any exposure to imports or global supply chains. Even the largest US exporting industries (oil and gas extraction, civilian aircraft and parts, and pharmaceuticals) rely in varying degrees on imported inputs, components, or capital equipment... which companies are you talking about?
Yet they seem to be begging for them pretty hard.
American socia media takes care that they are all engaged, quarrelsome, and polarized.
People who bought the F35 have mixed views. Awesome tech. Is there a remote off switch?
British arms factories are salivating at the prospect of NATO and EU spend. The French want to ring-fence them out but almost any complex materiel is made across Europe in the wider sense. Risk management drove there, I think France will stop being silly once their factories supply books are healthy.