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English is the universal language. Belgians can speak to Finn's in English. Iraqis can speak to Canadians in English. You get the picture.
That, only, is partly true. Educated Belgians can speak with educated Fins in English. These are the people you observe. Yet quite a lot of people (small minorities but still many people) there do not speak English. The further southeast you go in Europe, the bigger the problem.
Even on this site, we had members who did not master English.
There are a lot of places in Spain, but also in Germany, where I would have a hard time talking English with the locals. Not that it bothers me, I do not speak English with them but their own languages. In the Balkans, you might find yourself in places where you can speak German but not English with the locals.
I support a women's hockey team that signed an Argentinian Olympian. When she first played for the team, she did not understand English at all. She learned it online after she had come to the Netherlands. Up to that time, a Spanish player and I could communicate with her.
If you go to the (former) French colonies in Africa, you may not be able to speak English with the majority of people outside the capitals.
In a lot of countries, English is only spoken by people who have a job with international relations or work in places that attract many tourists that only speak English.