Once I think about it, what we call the American Revolution was actually a part of the truly first world war.
As you said, Britain was fighting the colonies here, but also the French once they committed.
They were also fighting off the Spanish and Portuguese I believe.
I seem to remember reading the Dutch were involved as well.
Though the British were the victors overall, it did cost them their American colonies.
But that’s all they lost.
Not only a world war, but a civil war as well.
Perhaps essentially a civil war, with multi-nation support on both sides.