Donald Trump's self-imposed deadline for a first round of tariffs on Canada, Mexico, and China looms in less than two days as economic observers and world leaders try to plan amid the uncertainty.

Manufacturers from Asia, Europe and elsewhere have poured billions into North American supply chains that could be hit by new taxes on Mexico, Canada and China.

Tariffs on goods from Mexico and Canada could arrive Saturday. Look for confusion on the border, higher prices and cheers from the steel industry.