Answer: To attract foreign investment and supply an educated and trained workforce to the growing industry jobs.
Step-by-step explanation:
The era after WW2 was one of growth in the economy and especially in industry. For people with tertiary qualifications, there was a chance of making a lot more money but at the time, not a lot of Americans had said tertiary qualifications.
States like South Carolina tried to solve that problem by creating technical colleges to give their people tertiary education that would educate them for industrial jobs. They hoped that having such skilled labor would attract foreign investment.