Suggested by John-117

How would Europe look today?
Would another World War have taken place?
How much impact would their rule have?
What other outcomes would there be?

Suggested by Battra Boy
Would anyone be able to stop General Grievous?
Would Maul be the mentor for a young Skywalker?
What impact would this have on the Empire?
What other outcomes would there be?

Suggested by John-117

How would the US look today?
Would another war taken place?
Would the South be it’s own country today?
What other outcomes would there be?

Suggested by orpheus12
Would the military be able to drive them off?
Would they try to communicate with the covenant on-board the ship?
What if the ship started to deploy it’s payload ? (I.e. Troops, scarabs, aircraft)
What other things could happen?

Would you cooperate?
Would you join them if the asked?
Would you resist?
What other possibilities could become of the event?

Suggested by Matapiojo

How would this impact the Warhammer 40K Universe?
What other outcomes would there be?

Suggested by Diana

How would this impact the Warhammer 40K universe?
How would this impact the other races?
Would new alliances be formed?
What other outcomes would there be?

Suggested by JerkwithNoName

Who, and how, would it have started?
Which countries would oppose each other, and who would be allied with who?
Just how devasting would a third World War be? (Not including the obvious damage nukes would do.)
Exactly what would YOU do once war has been declared?
Would you allow yourself to be drafted, willingly volunteer, or try to find some way to avoid joining the war?

Suggested by orpheus12
Would he attack them ?
Would he be able to over power them?
Would they take offense to his words?
What other things would happen?

Suggested by Envoy
Would you plot a world war?
Would you have an army of Geass Users?
Would you become a Hero?
What abilities would you get?
What else could happen?