What was the Berlin blockade?

Human rights groups in the 20th century worked to: o a. european imperial powers maintain control over their colonies. o b. convince citizens in impoverished countries to embrace nationalism. o o o o c. ensure that people around the world were protected from brutal treatment. o d. weaken the influence of international organizations like the united nations. sub

What types of subjects did public high schools in the 1900s emphasize and why

Can someone me out with this , i'm putting 30 points on it