* The Great Vowel Shift: This sound change, occurring primarily during the 14th-18th centuries, significantly altered the pronunciation of English vowels, marking a major shift from Middle English to Modern English.
* The invention of the printing press: The introduction of the printing press by William Caxton in 1476 standardized spelling and grammar, promoting a more uniform language across England.
* The Renaissance: This period of intellectual and cultural rebirth brought about a renewed interest in classical languages and literature, influencing English vocabulary and grammar.
* The Reformation: The religious reforms of the 16th century led to the translation of the Bible into English, further solidifying the language and its vocabulary.
Therefore, while the 15th century is considered the starting point, the evolution of Modern English continued throughout the 16th, 17th, and 18th centuries.
It's also important to remember that Modern English, like all languages, continues to evolve today. The influence of technology, globalization, and other factors continues to shape the language we speak and write.