Americans could help the germans through spreading the truth about the third reich. The germans need to finally see that there is a extrem big lie that the whole world believes. This lie is the only point with that the jews can use to hold their power.
That would be a big help.
But like the Führer said “Glaube niemals an fremde Hilfe. Niemals an Hilfe die außerhalb unserer eigenen Nation, unseres eigenen Volkes liegt/Never believe in foreign help. Never in help that comes from other nation, other folks.”
So the germans need to help themself.