The march of the mill children-review

The march of the mill children.

The march of the mill children, was a sad text to read. The text was about when over 10 thousand children went on strike for higher pay. Most of the children were under 10, and were not legally aloud to work but their bosses didn't seem to care. This all happened in 1903, and the children were working in a fabric mill.
From this text i have learnt about the strike, and what was happening in the mill.
I am still confused about why the children were working in the mill in the first place.