Question: why did edo became tokyo?
Answer: Originally named Edo, the city started to flourish after Tokugawa Ieyasu established the Tokugawa Shogunate here in 1603. ... The Edo Period lasted for nearly 260 years until the Meiji Restoration in 1868, when the Tokugawa Shogunate ended and imperial rule was restored. The Emperor moved to Edo, which was renamed Tokyo.