The US didn't open a trade route until after the Revolutionary War because if they did then they wouldn't have a relationship between China and the US.
The international relation is a terms that also refers to the international efforts and is the study of the interconnectedness of the politics, economics and the laws and is thus a forms the basis for the interaction of the entire aspects academic studies on a international arena and a global arena and thus involves the heads of the states and the intergovernmental organizations and the international organization that affects the individuals long with the MNC and the global systems.