Which statement below is true? a. the europeans brought deadly diseases to europe. b. the europeans brought deadly diseases to the new world. c. cures for diseases were found in the new world. d. none of the above

Why was the united states motivated to establish the open door policy? a. the policy guaranteed american commerce with china. b. the policy supported the chinese nationalist cause. c. the policy led to a gain of american colonies in asia. d. the policy claimed damages from the chinese.