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alternatehistory.com
well it is only an outline of an alternative history mod of Heart of Iron IV, but I will try my best express it clearly.
In 1582, Oda Nobunaga(織田信長) wasn't murdered by his subject in coup at Honnō-ji (Japanese: 本能寺の変).
the grey part is the area controlled by Oda clan in 1560
As a famous leader during Senkoku period, Nobunaga used his power to continue his conquest. Before his death, Japan was nearly under his rule. During 1620s, his son Oda Nobutada finally defeated all enemies and stablized his rule. The final shogunate - Oda began.
Different from our history, Nobunaga was interested with western culture, and focused on trade. His son succeeded his politics. Japan didn't apply policy of "Sakoku" (鎖国, country closed and an isolationistforeign policy) but kept open to westerns.