How the U.S.-China trade war is forcing countries to pick sides

One went to the United States. The other went to China. It was a sign of the times.

While the Swiss president was in Washington last week to lobby U.S. officials over President Donald Trump’s threatened 31% tariff on Swiss goods, the Swiss foreign minister was in Beijing, expressing his nation’s willingness to strengthen cooperation with China and upgrade a free trade agreement.

As Trump’s trade war locks the world’s two largest economies on a collision course, America’s unnerved...