Which policy required american indians to maintain the land they were given in exchange for receiving american citizenship and ownership of the land after 25 years?

a. the curtis act

b. compulsory boarding school attendance

c. worcester v. georgia

d. the dawes severalty act

Which of these did the soviet union do in 1961? it built a wall through berlin to keep people from moving to the west. it used force to destroy a wall the united states had built in berlin. it convinced the british and french to merge their zones in berlin with the soviet zone. it threatened to bomb berlin if the united states did not leave within 30 days.