China only had one of five dynasties in

10th century

Explanation:

the five dynasty and ten kingdom period was an era of division and political disturbance in 10th century imperial china in between the tang dynasty and the song dynasty. two highly successful dynasty

first second and third

explanation:

because its important to learn about other countries and how high tech they are compared to us. also its good to learn about other cultures and how ours differs and in common also we need to learn about companies that we still buy since they ship it here.