Brainleist (PLEASE ONLY HELPFUL ANSWERS) Select all the correct answers.
Which four of these developments were made under Mongol rule during the Pax Mongolica?
the extension of the Grand Canal in China
the spread of Christianity
the trade was encouraged with foreign states because they offered hospitality to foreign traders at Chinese ports.
the invention of new medicines
the establishment of a postal system
there was development of commerce and communication in the region along the Silk Road