He didn't. He started the process of unification, but was killed before he could complete it.
To unify Japan under his rule.
Oda Nobunaga was a daimyo of Japan
The three great unifiers of Japan were; Oda Nobunaga, Toyotomi Hideyoshi & Tokugawa Ieyasu.
The first of the "Three Great Unifiers" of Japan was Oda Nobunaga.
Oda Nobunaga
HIDEYOSHI WAS A SUMURAI IN ODA NOBUNAGA'S MILITARY ARMY
Oda Nobunaga was a Japanese Daimyo who is most famous for being the first of the "Three Great Unifiers" of Japan. (The other 2 being Toyotomi Hideyoshi and Tokugawa Ieyasu, respectively.)
Oda Nobunaga was born in Owari Province.
Oda Nobunaga consolidated Japan.
The cast of Oda Nobunaga - 1940 includes: Goro Abe Chiezo Kataoka as Nobunaga Oda Takashi Shimura Eiji Takagi
Oda Nobunaga died on June 21, 1582 at the age of 47.
Oda Nobunaga was the first of the three "Great Unifiers of Japan." He was known for his military prowess and his ruthlessness. His victories include: Okehazama (1560), Anegawa (1570) and Nagashino (1575) among others.