To answer the question of: What would have happened if Hitler did not ordered the invasion of Poland in September 1939, we have to first alter the events that lead up to the invasion of Poland. The first event was in 1936 when Hitler named von Ribbentrop foreign minister instead of Goering. Goering covered the post of Germany's foreign minister and Hitler was inclined to appoint him to that post. What changed his mind was Ribbentrop's success as foreign minister to Great Britain, when in 1935 he convinced the British to sign an Anglo-German naval treaty in which Germany agreed to limit its navy to 35% of the British navy. Hitler was convinced that this was the first step in his dream of an Anglo-German alliance and convinced himself Ribbentrop was "another Bismarck." (Hitler's words, not mine.) Ribbentrop's appointment to Foreign minister turned out to be a disaster for Hitler when it came time for Hitler to try and sign an alliance with Poland in 1939. Ribbentrop was arrogant and insulting to the Polish leaders (who lead a "fascist-military dictatorship). Goering on the other hand, had cultivated a friendship with the Polish leaders for several years. He had invaded them to go hunting on his estate in northern Germany and on several occasions he was invited to join the Polish leader on their hunting excursion in Poland. They trusted Goering. The second mistake Hitler made was the occupation of the rump state of "Czechia" (as the region of Bohemia and Moravia were referred to at the time) after the partition of Czechoslovakia in 1938. The Slovaks (with the encouragement of the Nazi government) wanted to separate from the Czechs and create an independent Slovakia. Hitler used this crisis as an excuse to invade the Czech portion of the Czecho-Slovakia. This panicked the Poles into signing a treaty with Britain in which Britain "had" to come to their aid if Germany (or any other power) violated Poland's boarder. But Hitler did not have to invade Bohemia and Moravia because the Czech president had already agreed to give the Slovaks their independence and was willing to join an independent Czech state with Germany in an economic custom union and agree not to sign any agreement with any foreign power, literally transforming a Czech state into Germany's sphere of influence with only one provision by Germany--not to occupy the new Czech state with German troops. If Hitler had not been bent on occupying Bohemia and Moravia and asked the British to join him in agreeing to the Czech proposal, he would have gotten everything he wanted, plus not panicking either the Poles nor the British in signing an alliance aimed at Germany. The possibility of Hitler convincing the Poles to sign an alliance with Germany (against the Soviet Union), which included the annexation of the "Free" city of Danzig, (which was 95% Germany and had voted into power it own Nazi government in 1938) and the construction of a railway and highway across the Polish corridor, was quite possible. Hitler would probably have signed agreements with the three Baltic states (Lithuania had rushed to sign an agreement with German in 1939 and returned the former German city of Memel to Germany), incorporating them into Germany's sphere of influence and the formation of an extended German-Soviet boarder that he wanted in a future invasion of the Soviet Union.
To answer the question of: What would have happened if Hitler did not ordered the invasion of Poland in September 1939, we have to first alter the events that lead up to the invasion of Poland. The first event was in 1936 when Hitler named von Ribbentrop foreign minister instead of Goering. Goering covered the post of Germany's foreign minister and Hitler was inclined to appoint him to that post. What changed his mind was Ribbentrop's success as foreign minister to Great Britain, when in 1935 he convinced the British to sign an Anglo-German naval treaty in which Germany agreed to limit its navy to 35% of the British navy. Hitler was convinced that this was the first step in his dream of an Anglo-German alliance and convinced himself Ribbentrop was "another Bismarck." (Hitler's words, not mine.) Ribbentrop's appointment to Foreign minister turned out to be a disaster for Hitler when it came time for Hitler to try and sign an alliance with Poland in 1939. Ribbentrop was arrogant and insulting to the Polish leaders (who lead a "fascist-military dictatorship). Goering on the other hand, had cultivated a friendship with the Polish leaders for several years. He had invaded them to go hunting on his estate in northern Germany and on several occasions he was invited to join the Polish leader on their hunting excursion in Poland. They trusted Goering. The second mistake Hitler made was the occupation of the rump state of "Czechia" (as the region of Bohemia and Moravia were referred to at the time) after the partition of Czechoslovakia in 1938. The Slovaks (with the encouragement of the Nazi government) wanted to separate from the Czechs and create an independent Slovakia. Hitler used this crisis as an excuse to invade the Czech portion of the Czecho-Slovakia. This panicked the Poles into signing a treaty with Britain in which Britain "had" to come to their aid if Germany (or any other power) violated Poland's boarder. But Hitler did not have to invade Bohemia and Moravia because the Czech president had already agreed to give the Slovaks their independence and was willing to join an independent Czech state with Germany in an economic custom union and agree not to sign any agreement with any foreign power, literally transforming a Czech state into Germany's sphere of influence with only one provision by Germany--not to occupy the new Czech state with German troops. If Hitler had not been bent on occupying Bohemia and Moravia and asked the British to join him in agreeing to the Czech proposal, he would have gotten everything he wanted, plus not panicking either the Poles nor the British in signing an alliance aimed at Germany. The possibility of Hitler convincing the Poles to sign an alliance with Germany (against the Soviet Union), which included the annexation of the "Free" city of Danzig, (which was 95% Germany and had voted into power it own Nazi government in 1938) and the construction of a railway and highway across the Polish corridor, was quite possible. Hitler would probably have signed agreements with the three Baltic states (Lithuania had rushed to sign an agreement with German in 1939 and returned the former German city of Memel to Germany), incorporating them into Germany's sphere of influence and the formation of an extended German-Soviet boarder that he wanted in a future invasion of the Soviet Union.
A very interesting thread.
Goring as foreign minister would be hopefully taken away from the 4 year plan and the Luftwaffe. BIG Positive!
(Perfect way to get Goring out of the way, promote him! Wining and dining foreign diplomats and wealthy, hunting, art, BIG noting himself)
I would however want to keep von Ribbentrop as special envoy to GB. You need someone who can handle "real numbers and facts". The traditional British "bank manager" approach.
While AH hated Poland and saw it as an artificial state, it is 38% German in '38 and almost a de-facto German territory. Poland is no friend of Russia or of Ukraine. It would be happy to get parts of Ukraine "back".
The Jews while hated by Poles, and live in a parallel culture in Poland, are more likely to be tolerated. Safer than Nazi Germany and those with position or money, safer than the Soviet Union.
The Baltic states need a friend. They have seen Finland cop it, and the writing is on the wall. The minority Baltic Germans (middle to upper class) will be keen to form a union with Germany and many fought for the Nazis over the Soviets.
Basically you control the Baltic rim (like that of Viking days). Sweden neutrality is under pressure. It could supply arms to Nazi "allies", without "technically" breaking it?
Norway / Denmark can be "liberated" earlier from British interference, much earlier and maybe with less resistance? The Netherlands, neither fish nor fowl, in alliances, is heavily "squeezed" as a Germanic language speaking nation to join the legion of non-Latin "Euro".
Germany's image would change from being a conqueror to a "liberator" or "protector". The gold reserves rushes off shore stay and used for "New Deal" in these outer states (re-arming and infrastructure for Germany's war machine)
Germany will have a buffer of states, very keen for Germany to maintain none aggression against the Soviets. They will not be for any Barbarossa that is 110% certain, but one that is 2000%.
For the West (especially isolationist USA) sadly it will probably "turn a blind eye". The Nazis are seen as a buffer and lesser evil than the Godless anti-capitalist communists.
AH with a flank fairly secured can give it to French, and finish off WW1 with (in his view) with the correct ending.
Great Britain and the Empire is alone. Spain will be ready to jump on the side of the winner.