[quote=The Nexerus]
^ I am willing to pause the war if an alien invasion of Earth occurs, but only if I keep Flanders.
[/quote]

If an alien invasion occured at this point in history, our only hope is a War of the Worlds effect. That said I read a great Mass Effect fanfiction that had the Quarian's uplifting humanity during WWII. They sided with the Nazis.