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>
When the Ottoman Turks took over Constantinople,trade was disrupted. This led European traders to seek a new way to trade with the Asian countries.Tea and spices were introduced and became essential to European diets.Fabrics such as silk and cotton also came from Asian traders.
Workers formed unions in the late 19th century to get higher wages shorter work hours and a 5 day work a week
