I believe it is B because mining tons were very popular therefore overcrowded
Answer:
Child labor was virtually eliminated when, for the first time in history, the productivity of parents in free labor markets rose to the point that it was no longer economically necessary for children to work in order to survive.
Historians now believe that the fatal severity of the Spanish flu’s “second wave” was caused by a mutated virus spread by wartime troop movements.
He began exploring North America in 1603
