Each sengoku daimyo formed the central power of influence in each region by being authorized to execute various powers such as "jurisdiction," "demand for military assistance," and "collection of Tansen (tax on rice fields)" by the Muromachi bakufu in place of the existing daimyo and then had their vested interests confirmed by Oshu-shioki (repression of the Oshu region) by Hideyoshi TOYOTOMI as the new central government.
どの戦国大名も従来の大名に替わって室町幕府に「郡検断」「軍勢催促」「段銭徴収」等の諸権力を公認されることで各地域の中心勢力を形成し、そして新しい中央政権たる豊臣秀吉の奥州仕置によって既得権益を追認された。