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I do recall "tractors" coming from "Traction Engines" during the Industrial Revolution... bout the same era?
Roughly late 19th century (late 1800s) when it was used with mechanical power. Modern usage as "tractor-trailer" came about 1916.
Truck on the other hand was used back as early as the 16th century, when they used horse and human powered carts to 'truck' something (e.g., goods from a farm to a city).
Tractors/semis essentially serve the same purpose as a 'truck', and the manufacturers are truck manufacturers and often use the words interchangeably, but when it gets down to configuration specifics, they do divide up the end product as truck or tractor.