Dear Yellow It is because we are identifying the specific "States" in question. They are not just any "states", but rather "the United States of America". The use of "the" is therefore correct grammar.
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yellowstarstruckHi, why do we need a "the" for the USA?All plural geographical proper nouns take the definite article: the United States, the Philippines, the Alps, the Hebrides. The article is also used with the abbreviation the USA.