The United States' economy depends on the goodwill of the world. Without their control of the international reserve currency it would utterly collapse. If that were to happen then the rest of the world would be in a strong position to make demands of the United States.

However, over the last few decades most western economies have become so entwined with America that a US collapse would take them down as well. Efforts have been made in the last few months to reduce those entanglements, but there's still a long way to go. If you want justice to be brought to America then the best thing you could do is boycott US goods and service whenever possible.