Chiang grew up at a time in which military defeats, natural disasters, famines, revolts, unequal treaties and civil wars had left the Manchu-dominated Qing dynasty destabilized and in debt. Successive demands of the Western powers and Japan since the Opium War had left China owing millions of taels of silver. During his first visit to Japan to pursue a military career from April 1906 to later that year, he describes himself having strong nationalistic feelings with a desire among other things to, 'expel the Manchu Qing and to restore China'. In a 1969 speech, Chiang related a story about his boat trip to Japan at nineteen years old. Another passenger on the ship, a Chinese fellow student who was in the habit of spitting on the floor, was chided by a Chinese sailor who said that Japanese people did not spit on the floor, but instead would spit into a handkerchief. Chiang used the story as an example of how the common man in 1969 Taiwan had not developed the spirit of public sanitation that Japan had. Chiang decided to pursue a military career. He began his military training at the Baoding Military Academy in 1906, the same year Japan left its bimetallic currency standard, devaluing its yen. He left for Tokyo Shinbu Gakko, a preparatory school for the Imperial Japanese Army Academy intended for Chinese students, in 1907. There, he came under the influence of compatriots to support the revolutionary movement to overthrow the Manchu-dominated Qing dynasty and to set up a Han-dominated Chinese republic. He befriended Chen Qimei, and in 1908 Chen brought Chiang into the Tongmenghui, an important revolutionary brotherhood of the era. Finishing his military schooling at Tokyo Shinbu Gakko, Chiang served in the Imperial Japanese Army from 1909 to 1911.