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Here are five points about the countries’ relationship:
Formal ties between Japan and the United States date back to the mid-19th century, when US Commodore Matthew Perry and his “black ships” flotilla forced Japan out of two centuries of self-imposed isolation.
The 20th century brought Japan’s brutal rampage across Asia and World War II, which ended in 1945 after the United States dropped atomic bombs on Hiroshima and Nagasaki.