Here's why:
* Historical roots: The English language spoken in America was brought over by colonists from England, but it has evolved independently over centuries.
* Different influences: American English has been influenced by other languages, like Native American languages, and later, European languages brought by immigrants.
* Regional variations: There are many regional variations of American English, but these are still distinct from English accents.
* Pronunciation differences: American English pronunciation differs significantly from English accents in vowel sounds, word stress, and the pronunciation of certain consonants.
While there may be some similarities between certain American accents and some English accents, they are still distinct and identifiable as separate dialects.