Here's why:
* Regional Dialects: The colonists brought with them various regional dialects of English from different parts of Britain. These dialects, with their unique pronunciations, vocabulary, and grammar, became ingrained in the American speech.
* Influence of Native American Languages: Many words and phrases from Native American languages found their way into American English, adding to its unique character.
* Innovation and Adaptation: The colonists encountered new experiences and environments in America, which led to the creation of new words and the adaptation of existing ones to reflect their new reality.
* Differing Standards of Spelling and Grammar: There was no standardized spelling or grammar in those early days. People wrote according to their own understanding and the prevailing usage of their region.
This constant evolution and mixing of influences resulted in a language that was distinct from its British origin. While the core of American English was still rooted in the English spoken across the Atlantic, it developed its own flavor, and over time, became a unique and vibrant language in its own right.