The issue of this cartoon is America having the key to China blocking the entrance. Also the other countries are trying to get a look in what China has. The cartoonist message is showing Uncle Sam bigger than all the other countries. Also he is showing all these countries that want to got to China. People might think that America is holding the power to China. Or that America is showing the other countries that America has the key to China. A technique the cartoonist used is symbolism because he showing the other countries outside of China. He also used exaggeration by making America bigger than all the other countries.

 Cartoon Of The Open Door  7 February 2016 https://sites.google.com/a/ncps-k12.org/amhnews-n-koller-2011/economic/hay-unlocks-the-doors-to-china/cartoon-of-the-open-door-policy