Oh for sure there are many differences, that comes with them being different languages, countries, ethnicity. You can do this on many levels.

The point was essentially what you're showing here: People focusing on all the differences instead of shared history, languages influencing each other and how we're all not that different in the end.

If you want to, even within what are nowadays countries and what outsiders would say is "one language" and "one ethnicity", you can start focusing on differences and make people dislike each other.