France didn't essentially fund the Colonies in the Revolution? England didn't back the poor Confederacy?
Almost a century is barely a wake, especially with life expectency what is it was back then. Social and technological progress from a basically medievel world to the dawn of the modern one made that gulf even wider.
There was no Germany prior to 1871, just States squabbling over hedgerows. We had to wait another half century for them to make noise on the world stage.
The colonial powers of the era and area were of concern: Britain (1812 was closer to both those other wars), Spain, Portugal, oh, and almost France. And they were, as we saw, more content to watch the US rip itself apart. At most, involvement would have been indirect, funding sides as proxys.