Before Donald Trump was President of the United States, he was a real-estate magnate in Manhattan who courted celebrity about as much as he courted the big deal. States as varied as Brazil, Canada and Spain are dismissing Trump’s noise and using it as an opportunity for a strategic reassessment. One poll from earlier this year found that only 9 percent of Canadians believed the United States was a trustworthy ally. In a world where great powers are unapologetically brazen, countries like Canada and Brazil need to be willing to adapt when the situation requires it. When the person leading that superpower is as irascible and unpredictable as Donald Trump, that dependency can turn into vulnerability.