Final answer:
Japanese isolationism involved restrictions on Japanese citizens leaving the country, and it ended with WWII. After its period of isolationism, Japan became an imperialist nation.
Step-by-step explanation:
Japanese isolationism refers to the period in which Japan limited its contact with the outside world. The statements that are true about Japanese isolationism are:
A. Japanese citizens were not allowed to leave the country: During this period, Japan had strict policies that restricted its citizens from leaving the country.
B. After its isolationism, Japan became an imperialist country: Japan's isolationism ended in the late 19th century, and it subsequently adopted an imperialist ideology, leading to territorial expansion in Asia.
D. Japanese isolationism ended with WWII: Japan's isolationist policies ended with the conclusion of World War II.