They did nothing until their advancing forces actually over-ran the camps.
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One way through which the allies dealt with the holocaust is to dismantle the weapons, tools and the Propaganda machinery being used by its perpetrators. WWII was a fight against the Nazi.
The Holocaust was not 'solved'. Rather it was stopped when Nazi Germany was defeated by the Allies.
You had to wait till the Allies arrived.
Yes, there are pictures taken by both sides and of course by the Allies after the fact.
The American government had no direct effect on the Holocaust. Obviously, the defeat of Nazi Germany by the Allies ended the genocide. I wonder if you are mistakenly equating the Holocaust with World War 2.
I don't think that the Holocaust actually "stands for" anything. It provides an illutration of certain things, but that is another matter.