A 10 per cent tariff on UK imports into America began on Saturday, as president Donald Trump began enacting increased taxes ...

The saying goes that when America sneezes the rest of the world catches a cold — pithy shorthand to describe how changes in the world’s biggest economy ripple out to impact everyone else.

On Thursday, the Dow fell more than 1,600 points, or nearly 4%. The S&P 500 fell nearly 5% and the Nasdaq plunged nearly 6%. Each of the three major US indexes recorded its worst performance in about ...