No its not actually the American accent is the original accent British people changed it around the start of the century. Thats why Canadians also sound the same and why when people sing they all seem to have the same accent.
“The loneliest people are the kindest. The saddest people smile the brightest. The most damaged people are the wisest. All because they do not wish to see anyone else suffer the way they do.” So sad, but very true.