6. He Spent Time on US Soil, Previous to the Pearl Harbor Attacks
Yamamoto was studious and he excelled in his education. Due to this, he set his sights on one of the greatest colleges in the world, attending Harvard University from 1919-1921. During the mid-1920s, Yamamoto also spent several years in Washington, D.C, discovering life as a naval attache.
While on US ground, Yamamoto learned English and shortly became fluent. He also traveled through the country, learning American customs and expanding his knowledge of US business practices. Naturally, the up-and-coming Admiral also learned how to play Bridge and poker, becoming a frequent gambler stateside as well.