No, but movements for minimum age limits in industry began in unions in the mid 1800s, and the Democratic party adopting a pro-minimum-age law stance was due to

No, but movements for minimum age limits in industry began in unions in the mid 1800s, and the Democratic party adopting a pro-minimum-age law stance was due to pressure from Unions. Similarly, the push for 8 hour workdays began with union support in the mid 1800s, 50+ years before Ford popularized it (and in fact it was due to this pressure that public sector employees had 8-hour workdays as early as 1869). Individual states had banned child labor and passed 8-hour workday laws (due to union and public pressure) far before Ford or the Textile mills did so "voluntarily".