That leverage came from the singular importance of the US market to the global economy. Trump’s personal belief in the utility of tariffs – and willingness to let them go into place and then, if necessary, escalate to shut down any retaliatory efforts – only served to enhance that reality.

With President Donald Trump's dramatic tariff hikes on the cusp of starting, countries around the world scrambled on Thursday to finalize their trade frameworks with the United States, figure out the tax rates their goods might face and prepare for the unknown.