Final answer:
Before transportation deregulation in 1978, it was prohibited for a company to own more than one mode of transportation.
Step-by-step explanation:
Transportation Deregulation in 1978
Before transportation deregulation in 1978, it was prohibited for a company to own more than one mode of transportation.
Transportation was the first target of deregulation under President Jimmy Carter. Congress enacted laws that removed most of the regulatory shields around aviation, trucking, and railroads. Companies were allowed to compete by utilizing any air, road, or rail route they chose, while more freely setting the rates for their services.