Research the new methods of warfare used during WW I.

New Weapons

Explanation:

World war 1 introduced the Airplane such as the Sopwith Camel and Folker Triplane. Also machine guns and Chemical weapons such as mustard gas were introduced into the battlefield. And tanks

the effect of the ming leaders banning ships with more than two masts was that there was no further construction of ships masts, because there was a surplus. ming emperors disallowed foreign exploration