In japan between 1603 and 1868, the most notable action taken by the Tokugawa shogunate was the: The military conquest of China
Tokugawa Shogunate realized that The regions in China (such as manchuria) has a lot more natural resources than the regions in Japan. During the period of 1603-1868, the shogunate created a lot of Military campaigns to took over these regions and improve Japan's economy.