Well, not selling to the US would be tough for countries whose products are heavily purchased by Americans.
Only in the short term. The world gives the US discounts in many ways because of their status as largest consumer. But, that needn't be the case. Stop giving concessions and start taxing their companies properly. Use that income to start building consumer confidence and spending, and shift the trade routes away from the US.
The people of the US are used to getting what they want whenever they want it. Look at the problems there already. Cut the consumer drug addicts off, and see what happens in the country.