Elven betrayal

America won World War 2, like actually this time, the government became an authoritarian regime under a General Douglas MacArthur and revitalized the manifest density, destroying the allies and the Axis and becoming the dominant superpower. With new technologies a massive nuclear weapon is deployed in the Pacific opening a portal into a new world called Auroria, which the Americans quickly apply their manifest density on. This is a short story regarding one front in this new war, The Elven Empire fighting a losing war against the Americans and its old world enemies, due to the shock and awe of American technology and tactics the Elven situation has become....untenable.