I only have partial lyrics to the recording by Charlie Oaks.

From Country Music Goes To War by Charles K. Wolfe, they are:

The Kaiser said to his soldiers,
Come on boys, let's go,
We'll conquer all of Europe
And the world will be our foe,
But we want to keep peace with Uncle Sam.

It continues to tell the story of the war in a fairly chronological manner, referring even to the coming of unrestricted U-boat warfare on Allied shipping.

Then they began sinking.
The best of the good old USA,
Then Woodrow said to Kaiser,
This game we'll help you play,
You can't run a bluff on Uncle Sam.