America
The most common flush toilet in America is the flapper-flush-valve type. The reason they are so popular is because they are inexpensive to make, easy to fix, easy to replace, and come in many different styles to match the style of ones house.
In America 3 out of 5 toilets sold are American Standard brand which gives them a big advantage on the style of toilets sold. In America today, a toilet is still referred to as "Water Closet" or "WC" on building and plumbing codes.
Did you know?
The toilet is flushed more times during the Super Bowl Halftime than at any time during the year.