East Asian Empires through history (Chinese, Mongolian, Korean and Japanese imperial systems and spheres of influence)
Sources:
Base map: https://commons.wikimedia.org/wiki/File:Asia_laea_location_map.svg
Chinese tributary system: https://commons.wikimedia.org/wiki/File:Qing_Dynasty_1820.png
Mongolian Empire: Asia Under the Mongols https://commons.wikimedia.org/wiki/File:Mongol_empire_1290.jpg
Japanese Empire: https://commons.wikimedia.org/wiki/File:Japanese_Empire_(orthographic_projection).svg

Korean Kingdoms: https://en.wikipedia.org/wiki/Goguryeo#/media/File:History_of_Korea-476.PNG
Own work
Nagihuin