The key thing to remeber is that accents change over time. The British accent at the time of the settlement of the present day USA was quite different from the British accent of today.
From what I understand, in those days the British accent was somewhat more like the present day US accent. As the US was settled, the accent there evolved one way and the accent in Britain evolved another way.
From what I understand, in those days the British accent was somewhat more like the present day US accent. As the US was settled, the accent there evolved one way and the accent in Britain evolved another way.