Foreign Nations Sharing a common language: English

Yes. It's true that English is spoken all over the world. It's also true more Chinese people speak English than the rest of us in the rest of the world too. All these things are true.

However,  the problem for English speakers is that in England how you speak about things is different. So, though I might as an American understand all the words I don't know what half of them mean. The same is true for listening to Australians or New Zealanders.

And Strangely enough when I went up into Banff and Jasper I had this same problem even though I didn't expect this at the time.

I was in a campground toilet and a man as I walked in was trying to tell me something. I had no idea what he was referring to because the slang was different than Americans use. Later I realized he was trying to tell me there was no toilet paper which was bad news for me because I found out too late for that to be helpful. So, it took me about 5 minutes to realize that was what he was trying to tell me and though it was very helpful I had no idea for at least 5 minutes what he was referring to because I didn't understand ANY of the slang words used in Jasper National Park by Canadians.

I had this same kind of experience in Northern Scotland because one of the dialects of Scottish I couldn't literally make out even one word of what they were saying. It's a strange feeling when you literally cannot understand another person who is supposed to be speaking the same language as you.