The core of the Declaration, brought up to date:
To secure life, liberty, and the pursuit of happiness, the present government of the United States was instituted by the Constitution of 1787. That government has long since become destructive of its legitimate ends, having enacted myriad abuses of its power while often failing to secure life, liberty, and the pursuit of happiness. It is therefore the right and duty of the people to alter, abolish, or secede from that government, and to replace it with a new government that strictly adheres to the original Constitution and Amendments I-X, XI-XV, XIX, XX, XXII, XXV, and XXVII.
(See “Constitution: Myths and Realities” for much more, including the legality of secession.)