Judo, a martial art that emphasizes throws and grappling techniques, was developed in Japan in the late 19th century and has become a popular sport around the world.

Natto, a fermented soybean dish that is known for its strong odor and slimy texture, is a popular Japanese food that is often eaten for breakfast.

Japan invaded Manchuria in 1931, which marked the beginning of its aggressive expansion in Asia prior to World War II.