Why did many states have to change their child-labor laws?

Because of mad parents protesting, mainly.

Explanation:

During that time things weren't exactly the safest In the work environment, even the jobs meant for women at the time were much more prone to worker injuries than nowadays.

Now when parents started understanding kids were being injured at these very strenuous/tough jobs they made the government basically enforce child labor laws or else some type of retaliation would've taken place.

i think it's b or c hope this

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.