The question as written makes no sense. Japanese-Americans did not perform imperial expansion. The Japanese and the Americans both engaged in imperial expansion individually and for different motives.
The importance of the navy in imperial expansion
Imperial Japanese Army ended in 1945.
Imperial Japanese Navy ended in 1947.
The Japanese Coat of Arms is The Imperial Seal of Japan. The symbol is a Chrysanthemum Seal or Chrysanthemum Flower Seal and is used by members of the Japanese Imperial Family.
Japan's conscription policies gave the Japanese army access to manpower and was able to install within its recruits the traditional Japanese culture the policy of total obedience to the Japanese imperial system. By 1937, its military expansion program created to 24 divisions, and 54 air squadrons. By 1941 Japan had 133 air squadrons and had an army of over one million troops. This was backed by two million trained reserves.
Japanese imperial expansion led the nation into the Southwestern Pacific, which America tried to deter via economic sanctions as well as other measures. Ultimately, the efforts were unsuccessful.
The importance of the navy in imperial expansion
Those who favored American imperial expansion in the late 19th and early 20th century believed it would provide bases for the U.S. Navy.
Imperial Japanese Airways was created in 1938.
Imperial Japanese Army was created in 1868.
Imperial Japanese Navy was created in 1869.
Imperial Japanese Army ended in 1945.
Imperial Japanese Navy ended in 1947.
Japan was in the Russo-Japanese War, the Boxer Rebellion, two Sino-Japanese Wars, World War 1, and World War 2. In all cases the goal was imperial expansion.
Japanese American internment during WW2 was ordered by United States in 1942 after Imperial Japan's attack on Pearl Harbor.
A year and a half declared war (1904-1905) fought between Tzarist Russia and Imperial Japan over territorial expansion.
Imperial Japanese Naval Academy was created in 1866.