Please have a look at the related question, which deals with some aspects of this.
In effect the US did stop the Holocaust. By aiding the Allied victory, in defeating Germany, the Holocaust was stopped. If the US could have stopped it sooner, it is possible that they could have, but at great cost.
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.
because no one objected to their anti-Jewish measures in the thirties, no one took in the Jews when they could and no one tried to stop the Holocaust.
There is no way to get your period to stop sooner, it is a bodily function that must be allowed to come to a end in its own time. There are methods to help reduce your flow which may help your period to end sooner, but there's nothing that guarantees this.
Tried to persuade the germans to free some jews in exchange of weaponary
Many weren't. It was that they couldn't do anything about it, they would be killed if they tried to resist. The Allies new and were fighting to stop this treatment.
You can't.
Other countries, especially America, did absolutely nothing!
Eventually it has to stop somewhere. 20 billion chinese in China will be impossible. However, it will come sooner than you think. In most advanced countries with birth rates goes down.
Economic growth will sooner or later slow down or stop altogether
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"
Through death - yes, everyone sooner or later stops smoking.