I do not think this is a question of strength of material of dynamic. The huge shafts of some gas turbines are built from segments Joint together by screws. I think this is a question of weight.
Actually, outside the US there is severe doubt that there will even be fair elections in 2028, Not even talking about the republicans accepting a democrat Victory.
You are Missing Seevetal Key facts.
First, why do the US import so much from Europe, among other places? Because they want the stuff, but cannot produce it on their own, at least not at the same price or quality. This will not change in the short term, so prices in the US will go up.
Second, trust is important in economy and trade. The US ist noch longer regarded as a trustworthy partner.