Answer:
A likely outcome is that World War II would have broken out earlier than on September 1, 1939. Adolf Hitler was actually preparing for war and the annexation of the Sudetenland and Czechoslovakia were just temporary moves with limited objectives. The real goal was to start war to finally achieve the great ends of the Nazi leadership: European and world domination. This is a good question for historians. Another possibility is that Germany would have to step back if it had seen determination of Britain and France not to appease it.
It is very unlikely that the Western Allies would have taken actions against the Japanese earlier, despite Japanese aggressive expansion in Manchuria and its aggression on China, as they were mainly concerned with the Nazi threat in Europe. This changed when the Japanese armies attacked and took European colonial possessions.
Step-by-step explanation: