2/10 - "American" is too generic of a term, and turning England into cowboy land doesn't make much sense because he would have trouble communicating with the locals as Old English is a different dialect than modern English meaning he would have trouble communicating. If this "American" were intelligent and could make modern devices, then he wouldn't be wanting to turn it into a cowboy land because cowboy and the Wild West was a difficult to control part of America during the turn of the 19th to 20th century. Also, since he is still an ordinary person, there would need to be great suspension of disbelief in order for him to be able to actually do anything without being killed for black magic or witchcraft.