Why are turning points important on the process of periodization

How have the government regulations changed the use of child labor since the 1800s

How did inca develop their road system? a) they used mortar to hold the stones together. b) they built suspension bridges over rivers. c) they mixed copper and stone together to make the blocks. d) they laid roads in the cities, not in the less densely populated deserts.

When was the versailles treaty signed