The Rhotic accent
English had become non-rhotic by the end of the 18th century. In 1776, both American and British accents were mainly rhotic. It was around this time when non-rhotic speech took off in the south of England, especially among the nobility. This “prestige” of talking non-rhotic was standardized, and it became to spread in Britain ever since.
There are some tips for working on your voice to make the rhotic accent: