How would it have changed history if Spain had Great Britain's colonies in Africa and Asia and Great Britain's had Spain's Colonies in North and South America? I have a feeling that the revolutions of the 1820s in Central and South America wouldn't have succeeded with Great Britain ruling there...
There was always the rumors that Adolf Eichmann was Jewish(When He was growing up the Kids called Him a little Jew). I wonder about the background of a lot of the Nazi Party officials
What if King William of Orange turned down the English Crown? I think Anne would have taken over as Queen like She did later on. I think England would have avoided(or tried to avoid) Louis XIV of France that William of Orange had them fighting. I think the fighting in Ireland would have went on...
It would be interesting if China conquered Korea and tried to put Japan under Their thumb in the 1400-1500 time period. There would be a pretty decent change for China to conquer both.
I believe it could have encouraged the Germans to maybe try an invasion of the Soviet Union in summer-fall 1940 instead of 1941. It would be like blood in the water to sharks