what historical event led to the United States transition from a free market economic system to a mixed market system?

The Market Revolution (1793–1909) in the United States was a drastic change in the manual-labor system originating in the South (and soon moving to the North) and later spreading to the entire world. Traditional commerce was made obsolete by improvements in transportation, communication, and industry.

south, because if you took a map you would see texas is directly in the middle of east and west, but it is also downwards towards mexico, therefore it is south

answer; identity theft;