What is the difference between the Declaration of Independence and the constitution?

The Declaration of Independence states that the United States of America is a country in its own right, independent of England, and includes a list of grievances against the king of England, while the U.S. Constitution formed our federal government and set the laws of the land.

South carolina was so angry about the election of lincoln that they seceded from the union on december 20, 1860. they attacked fort sumter later, on april 12, 1861.