I have both my IB Theory of Knowledge students and my ELL history classes do “What If?” projects, and they’re pretty popular. You can read all about them, and see student examples, at The Best Resources For Teaching “What If?” History Lessons.
Here are three new resources that students could review to get ideas for their own projects:
What If the Allies Had Lost World War I? is from The Atlantic.
Why We’d Be Better Off if Napoleon Never Lost at Waterloo is from The Smithsonian.
If you could undo one historical event, which would it be? is from Ideas.