The building of temples and great cities without modern machinery, using astronomy to predict astrological cycles and plant crops and using their language to communicate and measure time are some of the Mayans most notable achievements.<span> During a 600-year period of time, which was from 300 A.D. until 900 A.D., the Mayans made many great achievements in science, communications, engineering and agriculture</span>
It allowed the transportation of goods to be more efficient and quicker
The Mayans lived in what we now call Mexico and South America.
kublai khan grandson of ghengish khan was first mongol to rule whole china ......he began yuan dynasty in which many reform were made especially in trade and deplomatic relationship and expanded his kingdom
to the south
