I feel like it’s pretty safe to say that one of the most common teas in the Western world is black tea. There haven’t been the same kinds of concerted studies into black tea as there are into green tea, so I guess it’s not really in the news as often, but it seems to be the most likely to be found in the cup! Whether taken with milk and sugar or served iced, when in the US or the UK, black is what you’ll most readily find.
Interestingly enough, while black tea has really come to the forefront as the favorite in Europe and the US, it is probably the least consumed type of tea in China, where it (and all other tea) originated. Black teas in particular are produced in a number of different countries including China, India, Sri Lanka (formerly known as Ceylon), and even the US in more recent times.