History has seen many leaders of countries sign peace agreements and shake hands. Following this the people of the countries that were slaughtering each other sing and wave torches of joy.
Love reins on the lands and every one is happy.
One would like to believe this but the facts of these agreements and handshakes are different. There is no such thing as war or peace that happens overnight. These events are subject to the Natural Laws as every single thing is. They both have to germinate, grow and bear fruit. This takes time and it is foolish to believe they can come about in a day.