In 1905 when war broke out between Sweden and Norway, the German Kaiser immediately sent aid to the Swedes who were able to quell the rebellion.
When the former allies broke their adherence to the Armistice of 1918, the Grand Axis was revived and the USA and Germany supported each other in the The World War wherein Germany and the USA both made significant territorial gains and secured a more lasting peace with the Treaty of the Saarland.
The Scandinavian Union stood against Germany and squabbled over Denmark, capturing Copenhagen and other islands in the Ostersund Archipelago. Germany captured Denmark's mainland, however, and the area was hotly contested until Germany disintegrated following The Spasm.
Since The Spasm, Germany and the American statelets have been close allies against nuclear weapons, nonetheless maintaining their own stockpiles against the remnants of Russia.