N<span>ationalism helped cause World War 1 because i</span>t prompted European nations to break all ties with one another.
isaac newton found out how gravity works.
galileo found out how stars moved and mapped them
copernicus found that the sun was centered in our solar system
DescriptionChild slavery is the slavery of children. The enslavement of children can be traced back through history. Even after the abolition of slavery, children continue to be enslaved and trafficked in modern times, which is a particular problem in developing countries
