Which was common feature of feudal societies in Japan and Europe? O domination by a military class
strong central government
extensive contact with citizens of other countries
O
opportunity for social mobility

it would be domination but a military class out of the four options because the other three don’t fit.

well the fact it is basically a peninsula allowed trade to come from many places, thus allowing cultural diffusion to take place. india has seasonal monsoons that merchants travel back and forth from india using the monsoons wind patterns

the answer to your question is

the treaty of hopewell