This is the final paragraph of the Declaration of Independence that was signed in 1776.
"We, therefore, the Representatives of the united States of America, in General Congress, Assembled, appealing to the Supreme Judge of the world for the rectitude of our intentions, do, in the Name, and by Authority of the good People of these Colonies, solemnly publish and declare, That these United Colonies are, and of Right ought to be Free and Independent States; that they are Absolved from all Allegiance to the British Crown, and that all political connection between them and the State of Great Britain, is and ought to be totally dissolved; and that as Free and Independent States, they have full Power to levy War, conclude Peace, contract Alliances, establish Commerce, and to do all other Acts and Things which Independent States may of right do. And for the support of this Declaration, with a firm reliance on the protection of divine Providence, we mutually pledge to each other our Lives, our Fortunes and our sacred Honor."
It refers to the United States of America on that date, it just took the rest of the world a few years to recognize that we existed.
And it seems that a few today do not want history to be accurate.
The guidelines for locations say to use the names that the people used at that time and I just presented a document showing the leaders of The United States of America used that name in 1776.