What is one reason for Japan's involvement in the

first Sino-Japanese War and the annexation of

Korea?

(1) pursuit of imperialistic goals

(2) reaction to foreign invasions

(3) institution of five-year plans

(4) need for a warm-water port

One reason for Japan's involvement in the first Sino-Japanese War and the annexation of Korea was Japane's 1. pursuit of imperialistic goals. Japan had been industrializing for the bulk of the 20th century prior to these invasions; however, the Japanese mainland was very resource-poor. In order to ensure the constant access to raw materials necessary for industrialization, Japan invaded China and Korea.