The economic fallout began Saturday evening as Canada said it will retaliate with a 25% tariff on $30 billion (Canadian dollars) of U.S. goods, with another C$125 billion to follow in three weeks.

The United States’ political system also puts Trump at a disadvantage. Both China and Russia exercise near-complete control over their populations, using fear, surveillance, and repression to keep ...

By and large, however, Newtonian physics and traditional biology still apply, and that is worth remembering as we watch the ...