It is not difficult to choose international relations closely related to the country's economic strength and status. If you can go to the United States after graduating from high school, it is better to study this kind of major in the United States. In the world, the well-known countries in international relations research are the United States (Harvard University, Columbia University, Massachusetts Institute of Technology, etc. ), then Japan (Tokyo, Kyoto University), followed by developed countries in Europe and America, developed countries in other continents, etc. Personally, I don't recommend that you go to Canada to study international relations. Although it is a developed country, international relations are really nothing compared with the economy (so are Australia and New Zealand).
As for employment, there is really no need to care too much about this. Now is not the time for a diploma to decide everything. Some white Canadians can't find jobs after graduating from the University of Toronto majoring in international relations, but not necessarily these people are not strong enough.
Finally, I want to say, if you want to go abroad to work and let your descendants become China people, even though you may no longer have China nationality, don't forget your China identity. It is the most basic thing not to do anything harmful to the motherland. If you plan to return to China, you should also learn to be grounded. Don't be like many people who come back from studying abroad. They are no better than domestic college students, but they are inexplicably proud. Keep a clear head.