You’ve been trying to convince Historia to work with you to destroy Marley so that the inhabitants of Paradis island can be free. Since you have the founding titan you just need someone of royal blood to help you but Historia is reluctant even though as the queen she wants to save her people, She then begins yelling at you

“That isn’t the answer! Most of the people out there don’t have nothing to do with what we’ve gone through! You’d be killing innocent people!”