As people change, so do our dialects. In different parts of the country, foreign languages have left their mark. For example, German has influenced the speech of the Pennsylvania Dutch, African languages shaped the Gullah dialects of South Carolina, and French and English are intermingled by the Cajuns in Louisiana. When you think about the way someone from another part of the country talks, one thing that strikes you are the words that they use. Even though we all speak English, there are many words and expression that might as well be Greek to people from somewhere else.
Words do tell a lot about the people in a particular place.
There's no such thing as a one standard English accent that's better than all others, but there is a type of English favored by actors and radio and TV announcers. It may lack something in personality, but everybody can understand it. The dialect of many black Americans is what is often called black English. Although the roots of black English go back hundreds of years its use is still controversial today. One such dialect is that of the Boston Brahmins, whose British-sounding speech is becoming a thing of the past.