Final answer:
The premise of English teachers creating an artificial accent after Shakespeare's death is historically inaccurate. Accents evolve naturally, and the U.S. may be a nation where English has evolved differently.
Step-by-step explanation:
The question seems to be based on a premise that is historically inaccurate. There is no record of English school teachers altering the language after Shakespeare's death to make it sound more pleasant, nor is there a specific 'artificial' accent created by them that is now heard on the BBC. Instead, accents and pronunciations have evolved naturally over time in different regions. However, if we consider the notion of a nation that did not go through the same linguistic changes as England, the United States is a candidate. American English has its roots in the early modern English of Shakespeare's time but has evolved separately from British English due to geographical, historical, and social factors. After Shakespeare's death in 1616, the closure of theatres in 1642 by the Long Parliament and the Cromwellian ban on theatre led to a decline in English theatre, not to a deliberate alteration of the language by school teachers.
Furthermore, the British Empire's global influence and the subsequent rise of the United States as a cultural and technological superpower have spread the English language worldwide. However, local accents, pronunciations, and vocabulary have developed differently in various English-speaking countries.
Therefore, there is no specific nation that 'refused to accept' a change made by school teachers in England because such a change does not appear to have happened. The spread of English and its various dialects and accents can be attributed to a complex history of colonization, cultural exchange, and technological innovation.