Over the years, Americans are accustomed to call jelly by the popular brand name ‘Jell-O’. This has left them with an option to use the word ‘jelly’ to ask for jam on their breakfast tables. The trend caught on and has now become quite a tradition in America. It is just that jelly is more commonly used in American households, so Americans habitually call for jelly on their breakfast tables, even if they want to eat jam at times.