The most accurate response to how access to the labor of enslaved people changed the American colonial economy would be: "It allowed the development of a consumer culture due to increased wealth."
The system of enslaved labor contributed significantly to economic growth in the colonies, particularly in the southern region, where agriculture (such as tobacco and cotton) thrived. This increased wealth among plantation owners and traders facilitated the emergence of a consumer culture, as these individuals had more disposable income to spend on luxury goods and services.