The Constitution of the United States of America defines the US as a nation.
Representives
Representives
Declaration of Independence
the United States Supreme Court
The United States Constitution united the US states as one nation.
I assume by "the colonies" the question refers to the Thirteen Colonies which became the United States. The document that recognized the independence of the United States was the Treaty of Paris of 1783.
The document adopted on July 4, 1776 was the Declaration of Independence, which declared the United States a free nation separate from England.
the 52 states to make the united states
the 52 states to make the united states
United Kingdom The United States of America is the richest nation.
The nation that buys the most United States flags is the United States.