Isaac Asimov's Mother's Day, Isaac Asimov's Moons, Isaac Asimov's Fathers Day, Isaac Asimov's Christmas, Isaac Asimov's Utopias, Isaac Asimov's Earth, Isaac Asimov's War and so forth are all short story collections from Asimov magazine.
In one of them there's an alternate history where Islam, Iran, and so forth are not religious enemies but are united in a federation. America is the third world country divided and hopelessly backwards, at war with Canada, burns maple trees, maple syrup is on the black market. It's told from the perspective of a woman soldier who goes to America with war relief, is shot down out of the sky I think, and the head of their ambassador is sent home in a box after being cut off by American soldiers. Just because the they wanted them to stop fighting.
At the end of the book the woman hopes that the long war will eventually end someday.
What is the name of this story? Who is the Author? What book does it come from?