If you study the declaration of independence closely, it us clear that the declaration demands rights. And the oppressive regimes of the world would be unwilling to grant those rights. In order to achieve those rights, one will have to fight. And that will pave the way for war. It has become evident now after centuries. United States believed in the rights and freedom of the people. That had the U.S entering the world wars. All the wars after that too, were basically based on this very idea. FREEDOM.