During the post classical era china was the first to A. practice the buddhist religion
B. use paper money for trade
C. create poetry and literature
D. capture every japanese island

ok

explanation:

religion was the center of there society they practiced human sacrifices and which they believed kept there god strong and that he would keep bad guys away hope this

there are hundreds of postives ways to unite a country with another country here are a   few

1 peace treaty's peace treatys

are basically a document signing a allliance with one country and another.

2 gift

what i mean by this is for example how the french gave the americans the statue of libery a gift of peace.