Two of the world's most economically entwined neighbors stepped back from a self-inflicted wound on Tuesday, when the United States and Canada agreed to pause sweeping tariffs that had been hours away from taking effect. The reprieve — born of late-night negotiations between President Trump and Prime Minister Carney — buys three days for diplomats to address not just trade grievances, but deeper questions of defense, energy, and the terms of a continental partnership that moves nearly $2.5 billion across the shared border every day. It is a familiar human story: the cliff's edge reached, the l