Answer: US: Modern imperialism started in the 15th century when European countries discovered, and fought to claim, the New World. American imperialism began in the 1890s. In 1896 the US annexed the Hawaiian Islands. After the Spanish-American War the US annexed Puerto Rico, Guam, and the Philippines.
Japanese: The United States forcibly opened Japan to the outside world in 1853. ... Japan emulated the imperialistic behaviors of the Western powers. From the beginning of the Meiji Period in 1868, Japan's leaders sought to make the country an industrial and military power on par with the Western imperialist powers.
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your answer is
D. building a transcontinental railroad
