Why was the Declaration of Independence drafted after the revolution war had already started?

The ideas in the declaration of independence created a new national identity that united colonists behind a core set of beliefs and set the new nation apart from other countries throughout the world

Explanation:

du boi was considered a radical because he wanted the immediate end for segregation. the biggest different between him and booker t. washington is that, even though washington believed that segregation should be considered illegal, he did not believe at all that a law was needed to keep blacks away from whites and that this would be something natural (to have the races apart) for a long time until society adjusted, while du boi believe that agitation was the only way to end segregation.