When did the US shape itself as a single nation?

You cannot specify a specific date when the American nation was formed. The process of creating a single nation continues from the beginning of the founding of the first colonies (in the 16th century) up to our time. The United States is considered a melting pot that mixes immigrants from all over the world. At one time the country was proud of this, referring to the unique experience of such a mixture. Researchers, of course, are talking about the American nation. However, it is impossible to determine the criteria for its belonging. Therefore, the answer is as vague as possible: XVII – XXI centuries.