Years ago the US was a nation of mostly small towns. Every small town had one or two big factories making car parts, glass, furniture, electronics, machines or whatever. Every kid in the town, his dad worked at the factory and he knew he had a place held open for him there as soon as he got out of high school. For a long time after WWII a factory worker made enough to buy a house, two cars, have a wife and raise kids and send them to college. Most entry-level factory jobs had a 'career path' where if you were ambitious you could rise to managment or supervision and make even better money.
That's all gone away. Today small towns across the country are all boarded up, grass growing on Main St. The old factory is a crumbling ruin and kids have to move away after high school to find a job. Factory workers are now burger flippers, gardeners, or work intermittently at whatever they can find to do that pays enough to live on (barely).
If you want to have a good life today, you need a college education. What few good-paying manufacturing jobs are left are imminently in danger of being replaced with automation.
We have low unemployment today because there are plenty of jobs. But a CAREER, where you work yourself up the ladder, where you can confidently look forward to better pay as you get older, and a comfortable retirement, those are getting harder and harder to find. That's why so many young people are willing to go into debt that will take them decades to pay off, in hopes of gaining valuable, marketable skills that will keep them in the game.