Why the Royal Navy may have reached its high point in 1919

Why identify 1919 as the Royal Navy's peak rather than the 1897 Diamond Jubilee?

Because the German fleet was gone, Russia was divided, France was weak, and the US Navy still relied on standard battleships, leaving Britain overwhelmingly dominant.

An audience follow-up asks why 1919, rather than the 1897 Diamond Jubilee, should mark the Royal Navy's peak. After the First World War, the German Navy no longer existed as a rival and Russia's fleet was divided between Bolshevik and White forces. France's navy was weak, while the American fleet still centered on standard battleships. In this interpretation of the relative balance, Britain briefly possessed overwhelming naval power.