As often happens, Trump breaks with American presidential traditions more in style than in substance. In reality, the 45th and 47th president is in a tradition of realist presidents, going back to Theodore Roosevelt more than a century ago, who have viewed world politics as a great-power club, rather than an arena for idealism.
In brokering the Treaty of Portsmouth that ended the Russo-Japanese war of 1904-1905, for example, Theodore Roosevelt accepted a Japanese sphere of influence in Korea, South Manchuria, and Sakhalin Island as the price of maintaining a balance of power in East Asia between Russia and Japan. In his 1906 Nobel Peace Prize lecture, TR said that “it would be a masterstroke if those great powers honestly bent on peace would form a League of Peace not only to keep the peace among themselves, but to prevent, by force if necessary, its being broken by others”.