Yeah I see what you mean. It's a controversial opinion but i think that most to almost all PODs in the 20th century or later will do nothing to prevent the rise of the USA. Geography and such is just too much to their advantage, and it constrains alternate history possibilities with late PODs to a certain extent.
What's that? Germany won WW1? Well they get to have some fun being the biggest economy in the world an... oh, America's just overtaken them with their huge population, resources and industry. The axis want to win WW2 now? Well they defeat the soviets, take over europe and much of east asia and... get bombed to shit by tens of thousands of American bombers, and... oh look we have America dropping nukes now 5 years before anyone else will get them (that's why I got Britain out of the war early and kept the US out for TWR).
With an earlier POD, preventing a powerful single North American state having control over a large area as well as its vast resources, such as the great plains, would certainly shake up 20th century history.