Why was the Oshu-Uetsu Alliance formed? The 31 Tohoku clans, led by the Date clan, were defeated in the Boshin War.

On May 3, 1868 (the fourth year of the Keio era, or the first year of the Meiji era), the Oshu-Uetsu Reppan Alliance was formed among the Tohoku clans. It is relatively overshadowed by the impact of the bloodless surrender of Edo Castle and the Aizu War, but it was a very important presence in the Boshin War. Let's take a look at it while checking the timeline before and after.   The flow of the Boshin War in one minute First, let's take a quick…