I prefer the term Imperial Triad, because let's be real, Australia and South Korea are basically US provinces at this point in terms of policy (AUKUS for example). The UK is sometimes even more hawkish than the US, in part due to their unwavering Atlanticism. But if you want a good summary on what the Imperial Triad is, I recommend reading the article I've linked below

https://mronline.org/2022/12/05/samir-amin-how-to-defeat-the-collective-imperialism-of-the-triad/

Competition is just rhetoric, there is no competition. There is an oligarchy which is controlling the whole economic system. Now, we are facing a united front of imperialist powers, which are forming a Collective imperialism of the Triad. The Triad is the United States, Western and Central Europe, and Japan. This group of countries has become a single imperialist power, the leader of which is the US. .