is it Z or Z

[SuperSteveyLes]

I remember when I use to watch Sesame Street as a kid, everytime they covered the letter Z, it was pronounced Zee. I always used to shout 'It's Zed', then my Mum would tell me that they call it Zee in America and that Sesame Street is an American show. I was a bit confuse at the time because I use to think there were only 4 countries in the world, England, Scotland, Wales, and Ireland.