Yes, the refusal of the US to denounce the German treatment of Jews effectively gave Hitler and the Nazis permission to perpetrate the Holocaust.
It would be helpful if you could give the author's surname as the number of books of books on the Holocaust is enormous.
The Holocaust was not the fault of the US! It is sometimes said that the US and their Allies did not do much (or anything) to stop the Holocaust. See the related question.
They talk about the holocaust?
The US Constitution was not affected by Holocaust.
well the Holocaust is important to the worlds history.
no
Nothing specific, the US was fighting a war for most of the time during the Holocaust.
I wonder what you mean by holocaust communities.
This is the first time I've heard this suggestion, so it would be helpful if you would give the background to this question - for example, if would say where you encountered this idea.
The US constitution pre-dated the Holocaust by about 150 years, it did not prevent the Holocaust happening the first time. The Holocaust happened very far away from the USA, whether the US even had a constitution was totally irrelevant.
yes
This question confuses the Holocaust (genocide) with World War 2.