Agriculture is really labor intensive. This is also why children are out of school in the summer so they can help out with their family’s farm.
The necessity here is for cheap food prices, which are politically popular. We care about child labor (and minimum wages), but only so much, so we exempt certain businesses. The fact that a lot of these agricultural jobs are done by minorities is also relevant.
Rising urban density leads to less room for food growing and more people to feed...think about NYC and where all the food must come from to support 20 million people every day.
This is a common myth. There's more work to do during the spring and fall than the summer.
https://www.mentalfloss.com/article/56901/why-do-students-ge...
https://www.pbs.org/newshour/education/debunking-myth-summer...
> Federal laws prohibit children under 14 from working in most non-agriculture jobs.
One of the weirdest things of these laws is that agricultural jobs... don't seem any less dangerous than any others?