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>
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For example, other countries that wanted higher control of various regions started investing in other aspects of warfare such as aircraft building which was not covered in the conference. Japan for example started annexing territory in order to ensure greater control over the Pacific region which was also not forbidden by the conference.
