How was the Declaration of Independence important to the American war effort? What consequences did it have?

The Declaration of Independence helped unite the colonies so they would all fight together in the Civil War rather than turn on each other or refuse to aid, or rather instead of siding with England. The consequence was a greater stray from England which led to more tension and war between the two.

the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.