[dragonwriter]

> The WWI stalemate really got broken because the Allies - US, UK, and France - had a lot more in them

Mostly the US had a lot more in them, after sitting out the first 3/4 of the war.

[dgoldstein0]

Totally accurate. But also the British blockade of Central Europe was slowly starving the central powers. Maybe part of that was because the US was also supplying the allies...