In trade, we've acted too fairly with the other developed nations.
[1]https://www.theguardian.com/business/2016/oct/09/the-world-b...
And it is quite rich to say "we have reduced military affairs": the EU is suffering a massive migration crisis caused by the lie-based military intervention in Irak over 15 years ago, while the US refuses to take any of those migrants.
Most migrants come from Siria. And little matters which american polititian is to blame for this crisis: the US is mainly responsible, and unfairly does not play any role in mitigating the consequences by taking refugees.
Germany has taken close to 1 million, Turkey 3, Libanon has a 50% population increase. How is the US stepping up to the plate?
Europe contributes to the drug trade in Mexico whose instability leads to illegal crossings into the US. Over the years we’ve taken more millions. We don’t ask the EU to “do its part.”
Well, trade war it is then. And it might not be so easy to win against 95% of the world. Specially seeing how unfairly the US has been acting internationally: trade disputes are minor issues compared to the military and monetary abuses done by the US.