An earlier action could have been taken by capturing Hitler off guard and sending him to a Internment camp.
Answer1. Participants of the Evian conference of 1938 could have provided asylum to German Jews.
1. Britain and France should not have declared war on Germany under the pretext of saving Poland - neither they meant to protect Poland nor did they, never decalring war on the other invader, the USSR, and accepting a post-war settlement under which the USSR kept the annexed part of Poland - in fact, parts of the ex-USSR, namely, Ukraine and Belarus, are still keeping those parts of Poland to themselves.
2. Roosevelt and Churchill could have abstained from the demand for "unconditional surrender" of Germany at the Casablanca Conference in February 1943 thus clearly prolonging the war and suffering of the European Jews.
3. Jewish people could have been educated to the fact that guerrila warfare was illegal under international law and thus constituted a war crime in itself.
Kidnap Hitlers body, surrender to Allies and join forces against Russia
The necessity for air superiority.
The Allies promised that all war crimes and crimes against humanity would be investigated and prosecutions brought where appropriate.
The USA and its Allies Against Japan
Allies
Appeasement
Hitlers last offensive against the western allies (Russia (USSR) was Germany's primary enemy and was an Eastern enemy of Germany).
Japan, Italy, Romania, Hungary
Kidnap Hitlers body, surrender to Allies and join forces against Russia
Hitler would have won the war.
In the "Sussex Pledge" following the attack, Germany promised to limit its hostile actions against oceanliners. In return, it wanted the United States to force an end to the Allies' naval blockade of Germany.
The necessity for air superiority.
A. Sussex Pledge.
No. China was fighting Japan, Hitler's ally, in World War 2. China supported the Allies.
Sussex Pledge
Most were small in both population and economics and required allies to face France in battle.
No, they are allies.