France: Vive Henri IV. My favourite among all.
Ah yes, that's a good one too.
Lovely thought. Germany wins WW1, and some butterfly effect causes the US to adopt MCToT as its anthem. Come the 1940 Olympics, some event or other sees a Brit, a Yank and a Kraut taking the first three places, with the result that we get God Save the King, My Country 'Tis of Thee, and Heil Dir Im Siegeskrantz played in turn - the same tune repeated three times.
If you need another variation there's always Liechtenstein's Oben Am Jungen/Deutschen Rhein.