What is the feature numbered 4 in the lower right of this figure? 
Definitions:
Japan
An island nation in East Asia, known for its rich cultural heritage, advanced technology, and significant economic power.
American Economy
The American economy refers to the economic system of the United States, characterized by diverse industries, advanced technology, and a high level of consumption.
Internment
The detention or confinement of people, often in large groups, without trial, especially during wartime; historically applied to the forced relocation and confinement of Japanese Americans during World War II in the United States.
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