Not every product intended for the U.S. can be sold to different markets.

The U.S. will import less and our exports will likely also suffer because of retaliatory tariffs from other countries.

With trade U.S. agreements in the balance, Mexican authorities make a show of stemming the flow of illegal imports.

Once new levies take a bite out of imports, the currency’s value is likely to grow, making American goods more expensive for foreign buyers.

Exports of meat, corn and soybeans may grow even more expensive if tariffs take effect.

China is said to be a key target of rules motivated by national security. The tech industry calls it overreach.

Sales of U.S. services to other countries help to redress the balance, along with foreign institutions that invest in the American stock market and debt.

Exports of computer-related services rose too. “You sell the machine, but you also sell the engineers” who can set it up, one expert says.

There’s only so much capacity to store backed-up products, including foodstuffs.

They have been a positive contributor to GDP growth for almost every quarter over the past three years.