Answer:
Compass: Allowed sailors and navigators to find direction.
Gunpowder: Allowed us to make modern day weapons, such as guns.
Paper: Allowed us to write on a thing that can be mass produced and is efficient to use.
Explanation:
I'm pretty sure the answer is Britain
Schools in the United States started integrating in the 1950's as a direct result of the Brown v Board of Education Supreme Court ruling.