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"México" is a proper noun which is often translated as "Mexico", and "Estados Unidos" is a proper noun which is often translated as "United States". Learn more about the difference between "México" and "Estados Unidos" below.
Estados Unidos(
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dohs
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)A proper noun refers to the name of a person, place, or thing.
1. (country)
a. United States
Mi hija vive en Estados Unidos. La voy a visitar una vez al año.My daughter lives in the United States. I visit her once a year.