What happens before during and after a declaration war?

Before a declaration of war, diplomatic tensions typically escalate, with countries engaging in negotiations or ultimatums. During the declaration, an official announcement is made, often accompanied by a mobilization of military forces. Following the declaration, hostilities commence, and the conflict may lead to battles, alliances, or peace negotiations, depending on the war's progression and international responses. After the war, countries may engage in peace treaties, reparations, and reconstruction efforts to address the damages caused by the conflict.