Yes you are right about the Declaration of independence, but it only established our intent to separate from the British Crown.
The US Constitution made us a nation.
Based on a different understanding of natural law than what was put forth from the English point of view.
The US Constitution made us a nation.
The Declaration of Independence made us a Nation. The US Constitution wasn't written until 11 years later. Preceding it was the "Articles of Confederation" which was written in 1778 and ratified in 1781.
The US Constitution was our third governing document. The Articles of Confederation, along with our first President (John Hanson) are mostly forgotten now because they didn't last very long.