Major U.S. corporations and trading partners are scrambling to adapt to a new global economy, even as President Donald Trump mulls the imposition of historic tariffs in less than two weeks.

European exporters say a 30% U.S. import tariff would drive prices unsustainably high and hammer their sales. While some manufacturers are shifting their supply chains stateside or elsewhere, not all businesses have the same flexibility — and can't easily replace the developed U.