What is the difference between British and American letter writing?

There are two big differences between British English and American English: pronunciation and word usage.

There is no oblique sound in British English. In American English, /r/ can be placed after a vowel, while in British English, /r/ can only be used as a voiced consonant. Where American English uses /?/, British English almost always uses /a:/. For example, can't American pronunciation/k?nt/British pronunciation/ka: nt/, and dance American pronunciation/d?ns/British pronunciation/da: ns/.

Origin

American English originated from the English of Elizabeth I. Its history is very closely related to the history of immigration to the United States, which can be traced back to more than 300 years ago. In 1607, the first 120 colonists, including John Smith, crossed the Atlantic in three large ships and established Jamestown at the mouth of the James River in Virginia.

Shortly afterwards, in 1620, the Puritans from Norfolk and Suffolk in eastern England arrived in southeastern Massachusetts (Massachusetts) on the ship "May Flower" Plymouth, founded the colony. At that time, Britain was in the Elizabethan period, and from the perspective of the history of English development, it was in the early beginning of modern English.

Among the first Puritans to immigrate to New England, more than a hundred were graduates of Oxford and Cambridge universities. They brought Elizabethan English to the New World of North America and became the starting point of American English. From this time on, Elizabethan English was spoken in both countries. Therefore, for a long time, there was no significant difference between American English and British English.