Modern English
Modern English (sometimes New English or NE as opposed to Middle English and Old English) is the form of the English language spoken since the Great Vowel Shift in England, which began in the late 14th century and was completed in roughly 1550.
African-American English
African-American English began as early as the seventeenth century, when the Atlantic slave trade brought African slaves into the majority-white culture of British-colonial North America in an area that became the Southern United States in the late eighteenth century. During the development of plantation culture in this region, nonstandard dialects of English were widely spoken by British settlers, as well as likely some creolized varieties, probably resulting in both first- and second-language English varieties developed by African Americans. The nineteenth century's evolving cotton-plantation industry, and eventually the twentieth century's Great Migration, certainly contributed greatly to the spread of the first of these varieties as stable dialects of English. The most widespread modern dialect is known as African-American Vernacular English.