Pretty striaghtforward. There are many ways this war could have been avoided:
-It was the smalled margin of a successful vote to war in USA history
-The new British PM wanted a better relationship with the USA, and end the kidnapping of US sailors(news took to long to reach the USA)
-The Brits were the biggest trading partner of the USA, as opposed to France
So if the war vote is delayed and news reaches the USA that the new Pm is ending the internments, how does history change?