yes, it was by no means inevitable
Not really. The US was in a different continent, so it was problematic. The decision was made that the best way to stop the Holocaust was to achieve a military victory against Germany, so all efforts were made to do just that.
You can't.
Anne Frank didn't stop the Holocaust. She just made a diary on the thing. The Allies stopped the Holocaust. Anne Frank was just a teenager during the Holocaust. She could not have stopped it. The above answer is correct. See link below for more information.
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.
1945
December 21 2012
4 years.
They were afraid so they didnt.
The Allied forces defeated Germany.
The reason no one tried to stop the holocaust right away was either because no one knew about or that the German population were indoctrinated into hating the Jews. The allies later found out about the holocaust around 1943.
NO
They legalized anti-Semitism, paving the way to the Holocaust.