A number of sociologist, psychologists, and historians have attempted to explain why the German people didn't stop the atrocities of the Holocaust. Some possible reasons include the devastation German society felt after World War I as well as the effectiveness of Nazi Propaganda.
1918
Yes, though rather late. Poland resisted Hitler's demands and was invaded in September 1939. Britain and France declared war on Germany on 3 September 1939 in response to the invasion of Poland.
They did nothing until their advancing forces actually over-ran the camps.
Germany and Russia. The Germans wanted to stop Russia from advancing into Germany.
The Germans did a fine job of keeping the extermination process a secret until the end of the of course. While the Germans were retreating back to Berlin, they left the concentration camps as is without destroying them. Thus, the US military was able to seek medical help for those Jews who needed and exploit the German plot to the rest of the world. +++ The extermination and concentration camps were discovered and liberated by various of the Allied nations, not just the US. The Red Army (Soviet Russia) found many as they advanced from the East. Many of the German guards fled before they could be caught, especially fearing the Russians bent on revenge for the attempted Nazi invasion with its horrendous Siege of Stalingrad (now St. Petersburg).
Tried to persuade the germans to free some jews in exchange of weaponary
The killings stopped when the camps were liberated by the Allies. In many cases the SS fled as the Allies approached and left the camps.
Many of the groups the Nazis victimized - Jews, Communists, homosexuals - were held in contempt by many German people. Also, many Germans benefitted financially from the Holocaust.
You can't.
Because, if ANYONE tried, the Nazis would treat them like they were treating the Jews. And, when they did, death for them would be Instantaneous. Any protests=Yay! new pile of dead "Jews"
They could be argued that they were an ally because they did nothing to stop it and they refused emmigration to the Jews in the late 1930's and the early 1940's. But it would be going too far to call the USA an ally to the Holocaust.
Other countries, especially America, did absolutely nothing!
No one knew that the Holocaust would happen, not even those in charge of it.
Nothing. It's normal. It means you have to use the restroom or your food is digesting
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