Once in a while when I'm browsing YouTube for anime, I see a comment that says something along the lines of, "wow, how nostalgic. This was a big part of my childhood, I remember first seeing this scene when I was 4 years old and being blown away."
I'm always confused by such comments, since the video I'm usually watching is in Japanese and was never dubbed, let alone aired or sold in the United States. The possibility of the poster putting up a load of lies always looms, but it's more likely in my view that the poster is international and happens to speak English.
So, for we of the international community - what shows did you grow up with in your country, and what shows were you surprised to learn nobody in Country X saw/knew about before the internet? What do we share in common? This applies to all generations too - some people who grew up in the 1980's would know the first anime ported to the US, but a 16 year old today might not know anime existed before One Piece.
We could also discuss why we think certain shows were never aired or were censored in our respective countries. More on that below.
I can give the example in the US of Gatchaman and GoLion as Battle of the Planets and Voltron - those shows are unheard of in other countries, but were huge in the US.
At the same time, I've heard Doraemon was dubbed/aired in other countries but it never made it to the US. I've always thought it was too Japanese-centric for the US, but it seems to have gained popularity proper in the international community as well.