Which era is most associated with the efforts to end child labor in the united states?

How did the united states surprise other delegates at the washington naval conference in 1921

What is the significance of the battle of saratoga? a. the defeat at saratoga allowed the british to invade new england by land. b. after the defeat at saratoga france refuse to sign a treaty with the united states. c. the british won a decisive victory at saratoga. d. after the victory at saratoga france gave open support to the united states including arms money and ships.

How did the environments in north america affect the development of america indian cultures in the period just before europeans arrived