What advantage was the confederacy missing that might have turned the war in its favor?

the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.

on november 6 and 7, 1917 (or october 24 and 25 on the julian calendar, which is why the event is often referred to as the october revolution), leftist revolutionaries led by bolshevik party leader vladimir lenin launched a nearly bloodless coup d'état against the duma's provisional government.