Good question. I guess it is because there is no adjective for "United States". We would say "the German constitution" or "the English constitution", but we can't say "the United Statesian constitution" (or "the United Kingdoman constitution").
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Good question. I guess it is because there is no adjective for "United States". We would say "the German constitution" or "the English constitution", but we can't say "the United Statesian constitution" (or "the United Kingdoman constitution"). It is not a choice between the uninflected name and the possessive. You could put "the United States's constitution", but who would want to?
mehdi kord the United States
The country's name is "the United States". It is used as a noun adjunct or attributive noun modifying another noun. The form is singular (usually, not always) and nominal (not possessive). It is very common in English.