Who was Li Shimin?

A. a philosopher in the Song Dynasty
B. an emperor in the Tang Dynasty
C. a philosopher in the Tang Dynasty
D. an emperor in the Song Dynasty

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.