That's certainly not the case in the majority of Europe, Australia, New Zealand, East Africa, West Africa, South Africa, PNG, Fiji, Philippines, South Asia and South East Asia. Really it's mostly just America and Canada that use American.

I could cite many sources but https://en.wikipedia.org/wiki/American_and_British_English_s... provides a simple view.

Commonwealth nations tend to not use American English. They form a fairly major part of the world.