What did the US do to stop the holocaust?

The United States didn't technically 'stay out of the Holocaust' The States and the allies really didn't know what was going on in Europe. The Holocaust was very organized and kept under wraps until news of what was happening in Auschwitz, Treblinka etc.. broke out. No country really knew what was happening until they liberated the camps. Also, I believe that the US was busy with their own war: Japan. The atomic bomb, the attack on Pearl Harbour. The United States never entered the war until Pear Harbour was bombed. They always came in late in wars (WW1 and WW2). I believe some have said that is why their economy is so strong now. Not spending a lot of money compared to other countries on warfare because they weren't in the war as long as Britain or Canada for example.