Countries in the Americas

If you have already learned that most country names in Portuguese come with a definite article glued in front of them, the Americas are where that rule pays off the most: almost every country in this hemisphere takes one. Brazil is o Brasil, the United States is os Estados Unidos, Mexico is o México. The handful of exceptions — chiefly Cuba — stand out precisely because they break the pattern. This page gives you the article, the gender, the preposition, and the demonym for each major American country, and explains the logic so you can predict the rest.

Most American countries take the article

The default for an American country is "name with article." English uses a bare name — I live in Brazil — but Portuguese treats the country like an ordinary noun that needs its article, the way you would say o sol or a cidade. This is why you constantly hear Brazilians say o Brasil, never bare Brasil, in running speech.

The reason most American countries got an article is partly historical and partly phonetic — many of these names derive from geographic features (rivers, regions) that were themselves nouns: o Brasil (from the brazilwood, pau-brasil), o Equador (literally "the equator"), o Peru. You do not need to reconstruct that history for each one, but it explains why the article feels so natural to native speakers: the name still "sounds like" a common noun to the ear.

For an English speaker this is genuinely counterintuitive. English treats country names as pure proper nouns — Brazil is big, I love Mexico — with no article ever, and indeed inserting one (the Brazil) sounds wrong. Portuguese does the opposite: the article is the default, and omitting it is what sounds wrong (Brasil é grande feels clipped, almost headline-like). The mental switch you have to make is to stop treating these names as untouchable labels and start treating them as ordinary nouns that, like o carro or a casa, normally carry their article. Once that clicks, the prepositions on this page stop being a list to memorize and become predictable.

Reference table: the Americas

The gender column tells you whether to use o or a (or the plural os), which in turn drives the preposition (see the next section).

"os Estados Unidos" is grammatically plural

This is the detail that catches English speakers off guard. In English, the United States takes a singular verb (the United States is...). In Portuguese the name is a genuine masculine plural — literally "the United States" as in several states — so it triggers plural agreement on the verb and on adjectives.

The abbreviation os EUA (Estados Unidos da América) behaves the same way — plural article, plural verb. You will also see os Estados Unidos shortened in speech to just os Estados, but in writing the full name or os EUA is standard.

Why does this matter so much? Because the plural ripples through the whole sentence. Adjectives describing the country go plural (os Estados Unidos são ricos e poderosos), and the preposition uses the plural contraction em + os → nos, de + os → dos, a + os → aos. English collapses all of this into a singular because it mentally treats "the United States" as a single entity; Portuguese keeps the grammatical plural transparent. The same logic applies to other plural-named countries you may meet, such as os Países Baixos (the Netherlands) and as Filipinas (the Philippines) — all trigger plural agreement.

Prepositions follow the article

The article you saw in the table is what decides the preposition. With an article-bearing country, em + article contracts: em + o → no, em + a → na, em + os → nos. With article-less Cuba, the em stays bare.

The full preposition system — de/do/da for origin, para/pro/pra for destination, ir a/para — is laid out on its own page (see countries/prepositions-with-countries). The key takeaway here: once you know the article, the preposition is automatic.

Demonyms: lowercase and agreeing

The words for the people — brasileiro, mexicano, argentino — are adjectives. They agree in gender and number with whatever they describe, and unlike English they are lowercase. I am Brazilian is sou brasileiro (man) or sou brasileira (woman), never capitalized.

Two of these are invariable for gender: canadense (Canadian) and estadunidense end in -ense and use the same form for men and women — um cidadão canadense, uma escritora canadense. The full set of endings is covered in adjectives/nationality-adjectives.

"americano" vs "estadunidense"

In everyday Brazilian speech, americano means "from the USA" — that is simply how the word is used: música americana, um filme americano. Strictly speaking, americano could mean "from the Americas," and in formal, journalistic, or politically careful contexts writers prefer estadunidense (literally "United-States-ish") to refer specifically to the USA. Both are correct; they differ in register and precision.

Common Mistakes

Key Takeaways

• Nearly every American country takes a definite article: o Brasil, os Estados Unidos, o México, a Argentina, o Chile, o Peru, o Canadá, o Uruguai, o Paraguai, a Colômbia, a Venezuela, a Bolívia, o Equador.
• Cuba is the standout article-less exception → em Cuba, never no Cuba.
• os Estados Unidos / os EUA are grammatically plural → os EUA são.
• The article drives the preposition: no Brasil, nos EUA, na Argentina, em Cuba.
• Demonyms agree in gender and number and stay lowercase; in everyday speech americano = "from the USA," with estadunidense (formal) reserved for precision.