Again: "US-American" means "American from the German (=United) States of [the continent] America". You can repeat as often as you like to repeat the name "America" is the same like "USA" - but this never will become true. America is a continent and the USA is a country within this continent; She's one of 35 countries. And when the whole world will say "America = USA" then all people in the whole world will only speak out nonsense. Only when US-Americans within the USA say "America" to the USA or "states" to the USA then this is also correct, because in this case it is only a familiar short form of the expression "USA". Outside of the USA it makes not any sense to call the USA America. Reason - again - : America is a contintent and the USA is a country.
And Germans had been up to 100 years ago the very biggest population of the continent Europe with Celtic, Germanic and Roman ancestors. This changed meanwhile - also because of the USA - and because of World War 1+2. An US-American of the year 1913 has today 3 descendants in average - a German of the year 1913 has today 1/2 descendant. Additionally you wiped out some German nations in total - as for example the Silesians and Bohemians and some others. Today 25.1% (¿or 25.6%?) of the inhabitants of Germany had been born in a foreign country and/or both of their parents are born in a foreign country.
It is a fact that the USA had been the worst enemy Germany ever had in history - on not any reason which has anything so do with Germany on her own, because Germany never had done anything bad to the USA. Not before World War 1, not in World War 1, not between World War 1+2, not in World War 2 and also not after World War 2 - never.
But you hate Germany. Why? Bad winners?